If you don't find someone with the parts you need, here are some companies that I have dealt with and know they have the parts you need...
Mike at BE&A has new headlight rings, stainless steel fuel tank straps, the three piece tail panel trim and all of the slapstick parts.(new chrome housing, clear plastic gear selector and black plastic slider piece)
Tom at R/TSpecialties will have any clips or bolts or screws you'll need. I also bought new wheelwell mouldings from him. He also has a good selection of weatherstripping along with the body plug kits.
I did a lot of checking around on gas tank prices and manufacturers. I got my Spectra tank(wich is one of the good ones) from RockAuto.com. They had a great price and shipped it to me in record time.