Well I'm looking to get some help from some Z enthusiasts as I'm only a novice but I'm looking to get my 1990 300zx 2+2 N/A ready to go and road worthy with the final missing parts. So I'll just start by making a list of all the parts I currently am after and I would appreciate if everyone could show me where the best place to find them is as Ive had some trouble.

1. Catalytic converters. I need these to pass emissions. The rest of the car passes perfectly. I quickly found out why after taking apart the exhaust only to see the combs in the converters were gone. I found a guy awhile back willing to ship a set to me for a $100 total but he took them to the post office expecting them to ship them just wrapped in bubble wrap and since then I haven't been able to find any. I'd prefer the whole pipe set that leads to the manifolds, not just the cats.

2. Tonneau Cover/Cargo cover. I would need the clips that go in the interior to go with it. I've seen these once and awhile on EBay for around $100 but I was looking to see if there was a better place. I just want this for trunk privacy.

3. 1 Seat belt cover. The little plastic piece that covers the bolt at the top of the door to hold the seat belt in place. I've seen these on EBay and Z1 for around $5 a piece/set which isn't bad.

4. I also need help identifying the rubber gasket piece for the rear wiper. It's the piece that covers the shaft and plugs the otherwise giant whole that allows rain, snow, and all that other fun stuff to get in and into the trunk. I'd had no luck finding this at all. I'll post a picture just in case to show what I'm missing.
http://tinypic.com/r/34dreo4/7

All help is appreciated and thank you for reading.