The 2 in front of the firewall take 3/8 bolts, about 2 1/2 - 3", the rest take 5/16 fine, about 2 1/4 ". 1 each by the a and b pillar, one alongside the front rear axle spring mount, 2 in the trunk in the center 2 holes, and 2 in holes behind the front seat alongside the trans tunnnel. there's more mount locations but they're only fastened to the frame.