Even the Chinese ones are high at Car Quest (I work at one). The reason the 70-71 are so much higher is because they had such limited use, and there is a lower demand for them I think. I would seriously consider going to the later model spindles and rotors, as the rotors are much lower in cost and more plentiful. The general consensus has always been that you had to use 72-74 E-body spindles (hard to find) or 73-76 A-body spindles (easier to find, but supplies are drying up) to do this swap. It was said that spindles from later models which are 3/8" longer, which will bolt in, could put the upper ball joint in a bind in a suspension bottoming out situation, possibly breaking the ball joint. The March 2005 Mopar Muscle magazine has a good article on this where they tested the binding ball joint theory, and found that there is no problem using the longer spindle, and there is actually a slight improvement in caster over the A-body spindle. The spindles in question can be found on 73-up B-,F-,J-,M-, and R-body cars (much more plentiful in the salvage yards). The other plus to converting to later model spindles and rotors is that you can change the caliper mounting brackets and upgrade from the 10 & 7/8" rotors to the 11 & 3/4" rotors.I've got a 392 hemi in my 70 Cuda (very heavy engine) and saw a very big improvement in braking when I converted to the bigger rotors! I suggest you read the Mopar Muscle article before buying new rotors for your car.
