Jim,You are in Newark and Legendary interiors is right there.
They are capable to replicating the material but not sure if they actually do the re-upholstering.

C body sheetmetal is not in repop and the stuff that is-is not really good quality.
You are best off fabricating your own quarter or score a southern rust free skin.
Welcome to the C body world where we build them out of scratch and for love!!