I just got back from looking at a universal mount at one of the box auto parts stores. The only drawback I see with what they had for $12 is that it requires a 1" hole. If I can find a replacement antenna that uses the stock size or smaller I think I will go that route. I hate to cut a 1" hole since I may find a used stock one somewhere and don't want to have to add metal then. It the reproduction ones have problems I think a universal mount is better that $80 for something that isn't a lot better. Looking at Obi-Wan Graham's photos makes me think that I might be able to make the exposed black plastic part of the base. If I put it on the base of the universal mount and you wouldn't know the difference with out a trip under my dash. I am going to the truck graveyard and look for the base parts.

Neil
http://community.webshots.com/user/neilhatten