[notsolo]

Sizes no Torque spec's ........From GMC Pauls.............Ok I know its more info than you asked for but heres a cut & paste of the bolt info for Blazer / Jimmy / 1/2ton 2wd truck & 3/4ton 2wd 1/2&3/4ton 4X4 bolt lengths for Cab, Rad & Bed mounting
I figured as soon as I posted just 1 everyone would be asking for the others so I'm giving them all.
Radiator Support: 7/16"-13 x 3.375" carriage bolt
67-72 Blazer Body Mounting Hardware Sizes

Body Mount #1: 9/16"-12 x 6" hex head cap bolt

Body Mount #2: 3/8"- 16 x 10" Carriage bolt

Body Mount #3: 3/8"- 16 x 5.5" Carriage Bolt

Body Mount #4: 3/8"- 16 x 4.5" Carriage bolt

Body Mount #5: 3/8"- 16 x 5.5" Carriage bolt

3/4 ton, 1ton 2wd & All 4X4 Cab Mount Bolts
Front bolt 2- 9/16"-12 x 6" hex head cap bolt, 4- 9/16" large Diameter flat washers, 2- 9/16"-12 Nuts
Rear bolt 7/16"-14 X 8.5"