For your fuel filter, PCV valve, tranny filter and 180* thermo you can go to a parts store and ask the guys who work there. On the thermostat just tell them you need one the same size as the stock 195, but you want it in 180. There'* no "official" P/N for a 180 stat for our cars.
For wires, get the Belden premium wires at NAPA. I don't have them myself, but a lot of the members here recommend them and they've got a lifetime warranty, meaning you can go get a brand new set anytime they wear out. I'm not too certain on the plugs but you should be able to do a search or look in Techinfo to find everything you need about NGK or other part numbers.
Just a reminder, get an AC Delco O2 sensor, NOT a Bosch. If you don't have a Delco store in your area (and very few places will have a Delco O2 in stock) you'll need to order off www.gmpartsdirect.com
. If you need to double check your part number you can check out Techinfo. I know it'* there. Post any more questions as they come up.