Was pretty much a piece of cake. I had to drill out the holes in the buckets because the new rivets were bigger than the old. The rivets were simple because - duh - they are aluminum. I just used a center punch and a rivet plate I had from some leatherworking snaps. Worked like charm. New sockets and bulbs too.
Pics:
http://captaincheeto.com/pictures/64-gmc/turnsignals/

There is one place that you have not looked, and it is there - only there - that you shall find the master.