Hi Donnie - I've actually picked up quite a few 1975 since I first posted. My needs are down to the following to complete the set:
4, 5, 10, 46, 52, 172, 228, 236, 246, 263, 307, 421, 531, 542, 561, 611, 613, 617, 618, 619, 620, 622, 636, 638, 646, 649, 660
If you have any of these, I'd be...