This gas cap has male threads on it. They dont make it that way any more the gas caps nohave female threads and male on the tank they want to cut out the old bung and weld a new one on did not want to do that.
if the thread size and pitch is the still the same you could chuck up a peice of aluminum in the lathe, bore it and turn threads on OD, then part it off. Thread into new style cap with a lil loctite.
hope this helps,
PS if threads are different, it would be a little tougher but not a deal breaker