These will not fit the TX based leaf spring sleds. Just the Indy models, but will fit most all Indy models up into the 90s.

NOS Kelch 13" fuel cap used by many, but made for Polaris, part number 2870443. They came with no gasket. They will face upside down till you get a gasket in them. Gasket still available from Polaris

These were built in Wisconsin. Yes, you can still get Kelch gas caps for this application, but they have the ugly modern looking top on them. These are exactly what they came with originally.

You may or may not find the part number in the parts book. These are part numbered as an optional gas cap with gauge for sleds that came without. Not sure why they did that. I believe this part number is for the 79 Cobra, but will it early Indys and many others