Not sure if it's still available from the dealer or not. I know the grey gas caps first appeared in 83 on fuel injected vehicles such as the Turbo Coupe and Turbo GT. To be honest it's been so long since I've put gas in my 88 I don't remember what color the gas cap is. I think it might be black, though. I'd try a dealer first. You might get lucky on E-Bay, but I doubt it. Salvage yards would be your best bet. All mid 80's Fords had the grey gas cap, so you should be able to find one at a salvage yard.