'67-up k-members are alot different than the earlier ones, so hopefully you aren't going to try fitting the '73-up one on your '65. '66-down is the first gen, '67-'72 is the second, and '73-'76 is the third and final generation. You can adapt the '73-'76 into the '67-'72, but the whole k-member must be swapped in as well; the swaybar passes thru the front of the crossmember and mounts closer inboard than the '67-'72 (larger caliper clearance is needed on the last gen). Largest bar on '76 A-body? 1 1/8", hope that helps!