The previous owner installed fiberglass bumpers and didn't have the originals. I would have thought they would have been black with the W02 option. I've since replaced the front ones with the black powdercoated bumpers from gbodyparts. Oddly enough, there is a car for sale in my area that is black with chrome treatment, although from his description these were not original:
http://sfbay.craigslist.org/pen/cto/3948175364.html
Here is a pic of mine when it still had fiberglass bumper:
http://www.turbobuick.com/forums/threads/sf-bay-area-spotted-thread.244860/page-12 in post #233
The T badges have been removed, note the header panel is hood-ornament-less, I'm guessing the previous owner got a GN or GN repro and installed it. Also has an antenna delete fender - also probably not original as the car came with Concert Sound II. Also has a dealer installed astroroof