Non-Locking Gas Cap?

[HotShott]

Anybody know of one that'll fit a 450 tank?

[GearJammer]

http://www.mcwarehouse.com/newcustomchromesportstercatalog.htm

http://www.bitterendchoppers.com/Tanks2.html

I believe it could be done, but would require welding in a new gas cap filler bung, either for the screw-in type of cap (2nd link) or the old style raised bung (shown in the 1st pic of the 1st link).