What is the truck we are talking about?

Several years ago I got the complete 5 lug disc brake kit from Carter to put on my 59 gmc 1/2 ton. It was so ez a retrarded 9th grader could have put it on. Recently I put the 12 inch 6 lug disc brakes on another 59 gmc 1/2 ton. It wasn't quite as ez, but the end result is real nice.

Cotati ain't to far from SF. I may have a set of those rotors for you. They have been sitting for a bit, so they may or may not be usable. They were new and never used, but they have quite a bit of patina on them now.