[TonyL]

I've read that a 4 inch diesel trailer LED taillight will work on a corvair.

have a look at the following:
This is the current only way to get it done.

http://img213.imageshack.us/img213/2...26smallhf4.jpg
http://img295.imageshack.us/img295/3...99smalliu4.jpg
http://img176.imageshack.us/img176/9...31smallzy0.jpg
http://img293.imageshack.us/img293/7...05smalltx7.jpg
http://img214.imageshack.us/img214/7...opsmallbb2.jpg

Notice the gap between the lens and the bucket that had to be filled with silicone:

http://img221.imageshack.us/img221/6...07smallpm9.jpg