Re: B3 & B4 taillights - interchangeable??? (scottnbarb)
They will fit, but you will have to do drill new mounting holes since the B3 and B4 have different mounting holes. You might also have to enlarge the openings for the bulb harnesses.
Although B4 tails would look cool on a B3, you won't have quite the same look as if it were a B4 because B3's have a small crease down the side (that continues into the taillights), B4's don't.
They will fit, but you will have to do drill new mounting holes since the B3 and B4 have different mounting holes. You might also have to enlarge the openings for the bulb harnesses.
Although B4 tails would look cool on a B3, you won't have quite the same look as if it were a B4 because B3's have a small crease down the side (that continues into the taillights), B4's don't.