JD 855, 322, AMT626 plus whatever my son dragged home this month
I think the difference was in the length. The 70 fit on the 755, where the 70A was made for the 855 and 955. It may just be some of the brackets are different, rather than the main loader arms thogh - as mentioned - check JDparts.
I rode to a dealership today with a 70A loader. With my measuring tape and JD parts I figured it out. The mast which mounts to the tractor and is vertical is the difference. The 70 come straight up from the mount. The 70A resembles a reversed "L" which moves the loader forward. The brackets cost 500.00 a piece.