Ok here are the numbers for you:

Cab locking plates are 1/4" thick by 1" x 2-1/4" they are threaded for 3/8" NC bolts which are 1-1/2" long the holes are 1/2" in from the edge on the long-side. The shims are 1-3/4" x 2-1/4" with the holes the same from the long-side they are 15ga material but anything close would work. The bolts that hold the bracket to the frame are 1-1/4" long 3/8" NC.
Hope that helps.