If you are referring to the headlamp bezels, cars has them for 47.50 each part number hb847r for right side and part # hb847l for left side. www.buick-parts.com
But no, the pieces I'm looking for are the 4 surrounds/frames that actually hold/secure the headlamps. They are aluminum on the TRs, and black on 3rd Gen f-bods.
(A vendor of Buick parts sells them for TRs, at an additional mark-up over GM.) <--edit: At a 70% mark-up!
May need to get a TR set from junkyard & powdercoat them.
Very easy to locate some in good condition at the junkyard. I'm sure it's a lot easier and cheaper than getting new or getting some powder coated. Just my .02