These LED festoon fits perfectly in the 42 mm version of my car. It is very bright, so I can well behind the seats in total darkness still recognize something great! The only "negative" (therefore at the point 1 star deduction) I think it is "warm" to - therefore has a yellowish cast. I'd rather have cool white SMD. But the product itself can not be faulted, Highly Recommended - if you can live with the slightly warmer white.