body mount bolts

[chevymalibu283]

Hey guys, new name but ive been on this forum for a while and I have to say i am blown away with the cars, modifications and talent that I have seen on this site. That being said, I haven't seen mention of them but what size are the body mount bolts on the '78-'87 g body cars?!?! The bolts i ended up using in my '78 malibu are 7/16-18 thread if i remember right. When i went to get the bolts from a dealer they gave me a set of 9/16" bolts which proved to be the wrong size not sure why a car would have needed a bolt that large to secure it to the frame. Any thoughts or input would benefit everyone on the forum iI'm sure.

 

[pontiacgp]

If you had used the search for the body mount bolts you would have found a few threads with this info included...

position 1 uses GM P/N 10049638 (sold ea., 2 needed). Bolt is 12 X 1.75 X 95mm long.
95mm is not common so you have to use 100mm.

Position 3 uses GM P/N 14085301 (sold by pkgs. of 5, 2 needed). Bolt is 10 X 1.5 X 55mm long. Also need two nuts.

Position 2, 4, 6, 7 uses GM P/N 3524497 (sold by pkgs. of 5, 8 needed). Bolts are 10 X 1.5 X 80mm long.