[dsraven]

using the donor rad in the donor rad mounts, those larger parts with the big holes in them facing each other inside the frame horns. the other mounts, higher up on the frame horns, are for the actual rad support to fit into with urethane insulators. the rest of the body parts on my truck are original donor parts, so stock OEM stuff. if using the original 55-59 mounts for cab etc then use the original rad support mounts as well. you want it all to flax like it should.a soft rad support mount and a hard cab mount could equal cracking parts because they flex at different ratios but rely on each other to move as a set as the truck flexes over speed bumps or entry/exits to parking lots etc. don't want any door to fender interference problems.