well the rivet nuts were a COMPLETE FAILURE!! Now i got a mess from hell. Dont see how they are of any use. I installed the damn things and went to tighten the bolts up when mounting the ECU and the stupid rivet nuts turned! They refuse to grip the sheet metal enough to tighten much at all. I had to grab them with a pair of dykes and rip them out of the firewall. Now i am screwed.