This is a lead. They will need to painted in semi-gloss black. https://www.ebay.com/itm/Hurst-Olds...m=302431334477&_trksid=p2060778.c100290.m3507
He's been selling those for a while. If it fits an Olds, it's not a direct fit for Buick. But, you could use an adaptor. also note you will need to buy an electrical terminal for the top and the correct washer if you're fussy.