Well... Ebay has worked for me in the past (and generally does) but I never updated this with the rest of the saga. It was one of those things (and then another) but here's the story...
I ordered the centre cap I needed through ebay - when it arrived the seller turns out to have sent me the wrong centrecap for a 91-92 Corvette. Totally unusable as it would not have even come close to matching.
I emailed the seller who said she would sort it out and send me the correct one with an included envelope so I could return the incorrect cap. I never heard from her again (so I guess she figured out how much the postage was going to cost). Bad feedback was given by myself...
So I bought one secondhand from a wrecker, it looked correct but didn't fit into the recessed hub of my wheel without my removing 1/2 of the tabs and using sealant to stick it to the wheel. I was going to a show and wanted a centrecap on my wheel so it didnt look funny so I did a bodggie to get it there. ;40
Eventually I spoke to chromie and bought them off him, he had them in stock (new GM ones) and I didn't have any dramas. Problem solved. ;42 ;27