Reply to "Steering rack shims"

For U.S Panteras, the shim thickness is "around 5/16" but each Pantera will be a bit different if you want to truely minimize bump-steer. And when you add the shim(s), you'll find the rack and clamps move frontward and downward, so Bill Stropp's famous rack-brace doesn't fit anymore. You can re-drill the attach holes in the brace and frame and use 5/16" longer metric bolts so you don't strip out the threaded inserts up in the crossmember.
Or you can hacksaw about 5/16" off each steel rack-clamp surface (4 total) where the bolt heads touch. File the cuts smooth so the bolt heads contact your cut surface flat without any bending. Then the entire assembly goes together with the old bolts and unaltered Stropp brace.
I also like using shims that have slotted holes in their sides so they can be slid in from the side, instead of trying to balance and align the rack, two clamp-halves and the shim, while trying to get a bolt started. Oh, and don't forget to readjust the toe-in about 1/2 turn IN (not guaranteed perfect) on the steering rods; EVERYTHING you do up front changes toe-in!