Cool. I did a signal kit for the CA77 for a guy in Florida. I fabed a front bullet light kit and use an external switch. The back used a bracket that I mounted on the tail light/license plate bracket with bullet lights on each side.
Buco Twinmasters had two types of lens bodies. Early models had cone bodies where late models had the shallow flat type. The cone shaped bodies will convert to L.E.D. easily, but the flat type is harder to do because of the size of standard L.E.D. bulb. I build my own L.E.D. lights to fit the shallow body. I have also converted the Buco light bodies to double contact type to have both running and turn signals in the bags. As far as the latch, I have the originals rechromed. You can find new/near perfect latches at
http://www.vintagevibe.com Look for Rhodes Piano Case Latches. They don't have locks and need some minor mounting base mods, but they are real close and under $10.00 ea.
I have not found a source of Buco Rivits. I use a 3mm stainless hex button head screw and nuts and washers to replace the rivits. Usually I use 1/4 or 1/2" length in place of the rivits.
A great source for Buco stuff is by a seller on eBay called photolobo Tell them Chip sent ya.