sounds like you might have the original cover, it was about as you describe and gray - not sure any of the vendors have an accurate repro, haven't seen any of them, but you should be able to get the material here
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics
