I looked thru some odd A/G-body information that I have filed in a folder.
Regarding body mount bolts. They claim that there's 3 different size bolts.
Position- 1 uses p/n 10049638 (2 needed) 12 x 1.75 x 95mm long. 95mm is not common so you have to use 100mm. Also nuts needed. * I think I used 10mm x ? bolts & nuts. . It's been a number of years.
position- 3 uses p/n 14085301 ( sold in packages of 5, 2 needed) 10 x 1.50 x 55mm long.
position- 2, 4, 6, 7 uses p/n 3524497 (sold in packages of 5, 8 needed) 10 x 1.5 x 80mm long.
I've bought some of these bolts at my local GM dealer. They weren't cheap. Fortunately, several of the bolts that I removed were in like new condition, so I reused them. shhhh!
As for the hardness, I wouldn't use anything less than 10.9 . If you look around, I'm sure you can find them aftermarket.
A guy over at
Maliburacing, a few years ago was selling bolt sets for like $15.00. It was a good deal at the time.
Here's a set of bolts that Kirban offers.
http://www.kirbanperformance.com/produc ... 36974.html