The upper front a-arms on the '71 Panteras did not have a bend in the a-arm's rear channel. Factory caster is minimal at best, and there isn't any space for caster shims.
According to the orange parts book, there is a First Series (w/o adjustable caster) and a Second Series (w/adjustable caster). The front lower a-arms are listed as being the same.
Regarding the upper a-arms, I would have to either measure the spacing on the '71's upper frame mounts and compare that measurement to that of a '72 (which I don't have available to measure), or measure the a-arm. I suspect that there is a difference.
John