im sorry i just noticed you have kelsey brakes. i thought they were converted 73 and up brakes when i first looked at the pic. youll probably need to just rebuild the ones you have. i think all aftermarket stuff is based on 73 and up. i havnt researched 67-72 aftermarket stuff. someone else will have to answer your UCA question.
it appears qa1 has some tubular ones for a 72
