What ever you get make sure the riv-nuts you get have the tang on the diameter so it doesn't spin after it's crimped. It takes a special tool after the hole is drilled to notch the edge of the hole, then the riv-nut tang locates in the notch. There is a company local to me thats been an aircraft tool supplier for decades and I know they sell the riv-nuts and all the tools for them.
Below is their site page with riv-nut squeezers and notchers. I have a squeezer and a notcher for a #10 fastener. Bought them when I first got into the aircraft industry at age 18. I worked for a aircraft seat manufacturer in the R&D dept. We would custom fabricate a seat per customer requirements. Once the customer ok'ed the seat, it would go to the production side and get mass manufactured. Used these type of riv-nuts and tools daily.
USATCO.com
http://www.usatco.com/category/M37/1/1/120/1