2003 buick century.. salvage title.. not original part for blinker socket.. driver, front

Junkyard? Buick Dealer? Auto parts store?

Go to a parts store and see if you can match one up there.

Buick dealer or salvage.

That sounds like the same socket I have. After considerable research, I figured out that one of my headlight assemblies is an aftermarket (made by a company called "Eagle Eyes", part# KS-GM216). The socket used for the daytime running light and turn signal is not a standard GM socket. I was, however, able to locate a similar socket that will fit the aftermarket headlight assembly. The socket is a Toyota part# 90069-81003.