I took these out of a 70 chevelle ss a few years ago-I believe they are factory boxed-the inserts you buy and 71 and up had a V notch at the end-these had a sway bar attached -they are rough but solid-need new bushings will fit 1968-1972 A body cars-$99 plus shipping or can be picked up in Cambridge or Toronto
Thanks for looking!
Keep on Cruising!
Dave