Brake Drums

Interesting since your 74 has the more common 5 x 4.5" bolt pattern. Usually it is the 72- SBP cars that have some hard to find drums (ex. 10" rear). I would think other cars like Chevy would have used these drums, so maybe just a problem with the supplier's database. Look thru rockauto's Centric drums since they have a drawing giving all dimensions. I think brake drums are pretty generic, all the regular Bendix design.