Unlike the gray valve caps on GN's, I thought the GNX came with black ones. I was just looking at the 6000 mi GNX on eBay (eBay Motors: Buick : Grand National (item 260158636001 end time Sep-17-07 17:00:00 PDT)) and noticed gray caps. Sorry for the minutia but I will be lying awake tonight thinking what is stock? Black or Gray (I know I have to get a life)