Steering column bracket differences??

Yep 3 point one is from 67-72. 68 up used plastic isolaters. 67 used die cast ones. I am sure the reason behind the plastic ones was saving steps and materials in manufacturing, make it cheaper, just like the 67 only brazed in bronse bushing wiper linkages vs the 68 up cheapie plastic clip ones. Save a step or process. Save money. Bean counters in action. This is why 69 cuda coupes dont have door window and quarter window ledge stainless trim. My 69 had no holes for it in the quarters. Doors did, but were from other cars. Left was 69 fastback, right was 67 coupe. 69 fastbacks had the stainless trim on the window ledge. Some of this stuff like the isolaters and wiper bushings the customer wouldent know or care, and it worked well enough to get it out of warranty 5/50 back then without breaking.