The 62 color selector for the 62 Jetfire also calls out Medium Gray carpet for Trim 971. I think I still have the carpet I took out of one of my Jetfires. It was originally gray and turned brown just as yours did. If it would help I can send a piece of that carpet to you as well as a piece of the new gray carpet I bought from Pony Parts. Just thinking you might take them to the paint store, maybe they would let you spray some paint on the old carpet and check the color.