70 Z/28 rad core support & rear springs

[03C 70 z]

Is the rad core support identical for 70 & 71? Upon disassembly, I am not convinced the one on my car is correct & shows some damage. My car is a 70 and upon viewing a 71 some of the holes seem to be different. Not sure if mine is correct for a 70. If a 71 is the same, mine is wrong. Also, upon disassembly the rear springs are in very poor condition. Both bottom leaf's were broken at the center bolt. Is there a source to get them rebuilt or is there a good aftermarket replacement. I want to stay as close as possible to OEM rate & appearance if replaced.