pump to the 2 windshield jets. Are you sure that the front pump is bad.? I recently replaced the 2 rear supply pumps (from RA Trico units in link) in my 92 and the front booster pump still ok. https://www.rockauto.com/en/catalog/nissan,1990,300zx,3.0l+v6,1209686,wiper+&+washer,windshield+washer+pump,8840 If the front booster pump is needed you can get it below but the price is high. From what I can estimate from that parts diagram you could buy a RA rear pump and mod with a hose fitting the inflow nozzle diameter that receives water from the rear pump to accept the small diameter hose to the windshield jets. The rear pump units have a larger diameter intake that plugs into the water supply tank that could be reduced down for a smaller hose. https://www.nissanpartsdeal.com/parts-list/1992-nissan-300zx/windshield-washer.html?Diagram=289_A001
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