Have you tried the site's search bar?
These thread came up last week.....try these things.
1). Post a WTB thread on the parts forum.
2). Try GMC Pauls.
3). Try Classic Heartbeat.
4). There is a guy in Knoxville that carries OEM and used parts, supposed to be a top shelf kind of guy. (Bartender reference, means "best alcohol in the house."
https://knoxville.craigslist.org/pts...186248295.html