I will post on the For Sale file as well but wanted to update here.

I got the second gas tank out of the parts car on Friday, the one in the back seat area. Factory convertibles did not have this tank.

Both tanks are in very good condition. I do not know if the trunk tank is interchangeable with factory convertible from 89-91 or beyond.

If you have an H&E car might be worthwhile to have spares.