Wanted a 1960 gas tank Oldsmobile Fiesta wagon I have a friend looking for one, no luck so far... Any idea and or interchange tanks ???

 

If the Fiesta tank is the same as a regular wagon, you might take a look at a Buick tank and see if they are the same. It is still going to be a hard item to find.

 

Sorry to say it , but the parts book shows this gas tank all by itself.
Factory part number is 577791.
I checked my price book and this number does not cross over to any other make of GM car either.

 

Unless your tank has physical damage, you can make it hold gas again by taping over the bigger rust holes, pouring specialized resin into the tank, and rotating it until the interior surfaces are coated.

I did this with my first Vista Cruiser 40 years ago and the tank outlasted the car, driven daily in the rust belt. I'd think today's epoxies would be better than what I used.

For a start, look at something like , which illustrates the procedure with a motorcycle tank.