The lower picture looks like locking tabs for Hurst 4-speed shift rods when the rod ends back by the shifter are threaded for nuts. The D shaped hole makes them easy to recognize. That setup was nice because you could really dial out any slop where the rod adjuster connected to the shifter 1-2 and 3-4 plates. Once you tightened the nut to eliminate all play without binding, you folded over the locking tabs on that shim. Hurst discontinued them back at the turn of the century and replacements became scarce. I eventually had to switch back to the goofy clips and bushings when I had used up all of my replacement shim kits.