Put a Toyota 86, Scion FR-S and Subaru BRZ next to each other and the relationship is obvious.

They were developed around the same basic sports-car platform, their body shapes are closely related, and owners have been swapping parts between them since the cars were new.

Toyota itself describes the 86 and BRZ as jointly developed models. That shared background is one reason people naturally ask whether the headlights can also be swapped from one car to another.

The short answer is:

Sometimes they can be physically adapted, but that does not mean the headlights are electrically or functionally plug-and-play.

Before buying a complete headlight—or choosing retrofit parts inside one—it is worth looking at more than the shape of the housing.

They share a platform, but not every headlight specification

Toyota and Subaru worked together on the original 86 / BRZ project, so there is a lot of common architecture between the cars. Toyota discusses that shared development in its official history of the Toyota 86 and Subaru BRZ partnership.

The Scion FR-S was the North American Toyota-family version of the same basic car before it became the Toyota 86 for the 2017 model year.

That common base makes some cross-model headlight swaps possible.

But "possible" is different from "plug-and-play."

The actual headlight may vary in:

• light source
• projector design
• connector
• DRL wiring
• turn signal arrangement
• ballast or LED electronics
• internal mounting structure
• LHD or RHD beam pattern

So even when two housings can fit the same general body opening, the electrical side can still require work.

FR-S and BRZ headlights are a good example

Early Scion FR-S and Subaru BRZ cars are probably the clearest example of this issue.

An owner may prefer the appearance of a BRZ headlight and want to install it on an FR-S. Physically, this type of conversion has been done many times.

But some early swaps involve different electrical connectors.

A commonly documented FR-S-to-BRZ conversion uses a 6-pin-to-8-pin wiring adaptation so that the BRZ headlight and its LED daytime running light can work correctly on the FR-S.

That is a good example of why we would not describe the assemblies simply as "interchangeable."

The housing may be workable.

The wiring may not be.

If you are considering this particular conversion, this real-world BRZ headlight retrofit on an FR-S is a useful example of the connector and wiring work involved.

Halogen and HID make another difference

Even within one model, the headlights may not all be the same.

Early Scion FR-S parts listings, for example, include both halogen and HID headlight configurations.

That means identifying the badge on the car still does not completely identify the lamp.

If you have not checked that yet, our Toyota 86 / GT86 headlight type guide explains the halogen, xenon/HID and later LED configurations in more detail.

This becomes especially important when the goal is not simply swapping a complete housing, but replacing the projector inside it.

A projector bracket designed around one HID housing should not automatically be assumed to fit a halogen version just because both headlights belong to an FR-S.

The 2017 facelift creates another dividing line

The change from Scion FR-S to Toyota 86 in the U.S. also came with a significant lighting update.

Toyota's official 2017 Toyota 86 model information lists standard LED front headlamps, daytime running lights and turn signals.

That makes it risky to treat a later Toyota 86 as if it were simply an early FR-S with a Toyota badge.

The exterior styling changed, but more importantly for retrofit work, the headlight technology changed as well.

The same general caution applies when comparing pre-facelift and facelift GT86 headlights in other markets.

A headlight may look like it belongs to the same generation while using a very different internal system.

Physical fit is only one part of compatibility

When people ask whether two headlights "fit," they are often asking one question that should really be split into three.

Will the housing fit the car?

This is the first check.

Mounting tabs, bumper shape, fender alignment and hood clearance all matter.

Cars from the 86 / FR-S / BRZ family share a lot of basic geometry, which is why cross-model conversions are possible in the first place.

Will the electrical system work?

This is where many apparently simple swaps become more complicated.

Check the connector pin count and pin assignment, not just whether the plug looks similar.

You also need to account for:

• low beam
• high beam
• DRL
• turn signal
• position light
• ballast or LED driver
• grounds and control signals

An adapter harness can solve some combinations, but it should be built around the actual headlights and vehicle wiring rather than guessed from the model name.

Will the beam pattern suit the vehicle?

This point is sometimes overlooked when people buy headlights from another market.

A headlight intended for an LHD market and one intended for an RHD market may have different low-beam patterns.

That matters even if everything else physically bolts into place.

What about projector retrofit parts?

The same thinking applies inside the housing.

Royalin has two documented retrofit cases from this vehicle family, and they already show that one solution should not be stretched across every version.

Our 2012–2015 Toyota 86 / GT86 / Scion FR-S projector retrofit case uses a factory xenon headlight with an RX350-type original projector and a rear-mounted replacement arrangement.

A later 2016–2020 Toyota 86 / GT86 projector retrofit case uses a different bracket structure and front-mounted projector arrangement.

Both belong to the same broad 86 family.

They are still different retrofit jobs.

That is why we prefer to match a projector bracket to the actual headlight rather than creating one broad "86 / FR-S / BRZ" compatibility claim.

What should you check before swapping headlights?

If you already have both headlights in front of you, compare them before buying adapters or modifying wiring.

Start with the obvious things:

Check the mounting points and overall housing shape.

Then compare the rear connectors, part labels and lighting functions.

If the headlights use HID or LED systems, identify the ballast or driver as well.

For an internal retrofit, go one step further and look at the original projector, mounting pattern and available rear clearance.

A few clear photos usually answer most of these questions.

Similar cars don't always mean identical headlights

The Toyota 86, GT86, Scion FR-S and Subaru BRZ are closely related cars. That relationship makes headlight swapping and retrofit work much easier than it would be between unrelated platforms.

But it does not turn every headlight into a direct replacement.

A BRZ headlight may physically work on an FR-S but need wiring changes. An early HID housing may need completely different retrofit parts from a halogen version. A facelift Toyota 86 LED headlight should not be treated as an early FR-S lamp.

If the goal is simply better lighting rather than changing to another brand's housing, it may also be worth keeping the existing OEM headlight and upgrading the projector inside it. Our Toyota 86 / GT86 headlight upgrade guide goes through those options in more detail.

For retrofit shops, the safest approach is simple: start with the actual headlight in front of you, then decide what is genuinely compatible.