Nissan Factory Part Number is 16603 I believe. See if you can get a part number of them and do a search for it on google. depends what you get anywhere from 300-1500 depends what you want, how much power you making/planning on, how bigs your pump, fuel reg, computer etc. you need to give more details if you want a good recomendation.
mine? no idea, there of an RB26 so will fit one of them for sure