BTW, I was poking around on rockauto and noticed that small-block Volare lists a Sanden compressor for after-market AC only. The Sanden brackets I have for a Volare slant appear factory since the compressor belt runs on the inner crank pulley.
Chrysler's own dealer-installed A/C setups used the aft pulley compressor drive, just like the factory setup. When we're talking about non-aft-pulley compressor drives, "aftermarket" really means aftermarket, the non-Chrysler setups from Mark IV, Frigi-King, Sears, etc. Those are the ones that tended to use a pulley bolted onto the front of the vibration damper to drive the compressor.
Sanden (at that time "Sankyo") SD-series compressors were used in relatively small quantity by Chrysler on some vehicles in the '78-'81ish timeframe. Sankyo SDs also with Chrysler dealer-installed setups of that same timeframe. And Sankyo SDs again when the failure rate climbed too high with the Nippondenso C-171 compressor for awhile and a line of Sankyo SDs was brought out with C-171 type mounts for direct replacement. Once the C-171 gremlins were worked out, Chrysler reverted to using them—well into the '90s. The Sankyo/Sanden is a better compressor, but the Denso C-171 is a trifle cheaper, and Chrysler never met a tenth of a cent they didn't try to squeeze a gallon of blood out of.
