That was what confused me... Some that I saw had the same part #s from 67-81 and some not. I know there were different spring rates due to weight throughout the years.
I had considered using some Hotchkis leafs that I bought for my 79 T/A on my newly acquired 69 Firebird when it arrived but oops I wound up putting them on the 79 this weekend. Guess I'll just start shopping for 69 specific items.