Infiniti J30 93-97 (without HICAS) crank pulley part number 12303-10Y00
It's the same part number for 300zx (90-96 NA) and (94-96 TT) this is the 3 rib power steering belt application

Infiniti J30 93-97 water pump pulley is 21051-0P500
the 300zx water pump and water pump pulleys have different part numbers from the J30.
The water pump pulleys look the same. What lightened (and underdrive) pulleys have you guys used for your J30 (part # please)
is the stock 300zx water pump pulley just larger for more cooling?
I guess I mostly just want to know if it will fit on the end of my J30 water pump.

turbo versions of the 300ZX used a different water pump than the J (I don't know why?).