Correct A/C compressor part number?

[classic cars]

The FAQ section mentions a Nippondenso 10PA17C as the A/C compressor number but then, there is another mention of a Nippondenso 10PA15C part number.
Do you know which one is the correct one for a '91 NSX?
I found out that these are very commonly used compressors, also used in the Porsche 993, Mitsubishi Pajero and many Mercedes models. Are they all interchangeable?
Thanks guys

 

[Larry Bastanza]

The car comes from the factory with the 10PA15C. However a 10PA17C can be used. The "15" and "17" denote the displacement of the compressor, i.e. 150cc vs. 170cc. It has been recommended that the "17" is a good choice (thanks Mark Basch) if you are converting from R12 to R134a, especially if you are in warmer climates.

HTH,
LarryB