I don't think this has been done, you can be our guinea pig... mwuhahaha!
No, seriously, go to a VW dealership, pull up beside any of cars, and check out the side markers (All the VW's/audi's have basically the same size markers) and compare. I don't think there's going to be a large difference in size. From the pics I've seen of all the makes, alot of them look to be the same size, they just have different shapes (i.e. some are oval, others are rounded rectangles, teardrop, etc...) Let us know.