If you go back and read this thread -
http://www.honda305.com/forums/ca77-lam ... t5820.html - and take a look at the photo posted by joeweir1 back in 2006 it appears that he just high temp RTV'd the bulb in place without any additional holder. The photo of the bulbs I've got coming from Amazon show that this should be doable. They've got a good flange that will provide a fit to the back of the reflector after taking the old socket out and enlarging the hole somewhat.
I'm going to try it that way and see what success I get.