The system is set up with the 10PA15C or 10PA17C compressor's operating
characteristics/specifications.
You'd have to know a lot more than I do to re-engineer/retro-fit another type
compressor.

You can take a stab at rebuilding your old compressor yourself,if you feel
handy enough.

http://www.pelicanparts.com/techarticles/911_Nippondenso_rebuild/911_Nippondenso_rebuild.htm

OR call: http://www.ackits.com/

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'84 300SD sold
124.128