I have a new Moser 9" with 31 spline axles for 64-72 Chevelles. Never used, never even mocked up. Trying to buy a new house so the chevelle project has to go. Summit has it for $979 plus freight.
The only thing left is basically the body and frame. It's a 138 car so I'm sure its worth more over at chevelles.com. Its a CA car that has been sitting since the 80's.
I may be wrong... I am not a Chevelle specialist by any means, but I believe the 64-66 has a coil spring pad that allows for the coil spring to "bolt in place" with a plate that sandwiches the bottom coil with the coil pad. Where as 68-72 the spring simply sits on top of the pad. I know 67 is a transition year. I will try to dig up my receipt on this thing to determine the actual part number that I ordered.
I used that link to show what it was but I just searched by year/make/model.
I went round and round when I ordered it, and I believe the two styles of spring pads were the only difference.