I just need a replacement cap to build a pressure bleeder. I only need one that seals tightly, I don't need one with wires in it or anything fancy. Anyone know where to find one?

you can get one for a few bucks from any nissan / infiniti dealership. you might get lucky at an auto parts store...just take yours in to compare.

also, courtesy parts is a good source for OEM parts...should be the same part number on a 350z:
http://www.courtesyparts.com/350z-pa...4_715_806.html