'71 Eldorado Fuel Tank

Just found some pinholes on the top of my fuel tank and need to buy a replacement.
I can't find an exact replacement anywhere online. I found one for every car but mine.
Anyone know where I can find a new gas tank or if I can use one that's for another car?
I would really appreciate some help. Thanks.

USA _autoparts, 650$.

That's way too much, I'm going to try to install a similar one if that's my only option.