E34 headlight lens on e30 lights

[NathZz]

Are e34 and e30 headlight lenses interchangable?

[AndrewBird]

Only euro ellipsoids are the same.

[spike68]

If you're speaking specifically to the glass or plastic lens only, yes. Just be careful if they're glass. I broke one lens trying to swap it over and got a decent cut. I also wouldn't recommend swapping lenses unless you have both sets just laying around. It's worth it to just buy new headlights sometimes.