While not MV specific, there are a lot of parts that would serve well on a lot of MVs, without the MV Vendor markup.
http://www.restorationstuff.com/Catalog/catalog.html
Hose clamps looked OK, a lot of the wiring stuff looked good. The ad section at the end give a lot of good places for gauge resto and such. The drive rivets, split rivets and a log of the cable hangers are also worth a look.