I purchased the best one from Classic Industries 4 years ago for my '85 K10 that has sat in the garage and had maybe an hour of daylight over this time, it's delaminating and has a large bubble near where it wraps around the gauge cluster on the right side. It never fit that great from day one. In their defense though, my garage does get over 130 degrees in the summer often, it's brutal in there.
Been saving old dash cores and the wife keeps talking she is going figure out how to recover them. After seeing some of them at shows, they can come out great and fit.
One of the trucks I bought, the guy said he had some stuff in the shed for it. I didn't think much of it at the time but it was a filthy grey dash pad, got it home, set it aside, week or two later actually looked at it, its a never installed, NOS, out of box pad that needs painted. None of the mounting holes had been poked through yet. I am not sure what I am going to do with it, it's not mint, shop worn but never installed. The edges are beginning to curl around the vin and vent areas so it's been kicking around for a while.