Another difference between the two are the 6 bolt holes for the bolts that come up through the bottom of the cross-member into the bottom of the frame.
The 62 -
The 72-
On the 72 cross-member the 6 large bolt holes (3 on each side) are equally spaced front to back. On the 62 the front two holes are spaced the same as the 72 but the rear hole is not, so the rear hole on the new cross-member needed to be slotted forward to match the 62 frame.
One other thing is the hardware. All the cross-member mounting bolts on the 62 are grade 8 fine thread 3/8ths x 1 1/2. The 72 uses a combination of different length 3/8ths and 7/16ths all grade 8 coarse thread.
The 72 also came with this brace in the frame C channel -
I may try to use this by cutting off the top ear so that it will fit the shorter 62 frame.
This week will be cleaning frame and firewall and fitment of Capt Fabs brake booster bracket and clutch master.