I'd be surprised if there was much available that wasn't Dorman or Spectre for something that old.
Vintage is awesome!! I have been charged shipping from them before, but it was on a fairly large and heavy part and even then it was reasonable.Part #22514526 may be available at Vintage Parts Inc., a company in WI that buys up obsolete parts. I looked up a 1987 Brougham to get that number, it says it's for export markets/leaded fuel in the notes.
By the way, a local GM dealer should be able to order it for you from VPI with no shipping charge, but you will want to verify pricing with them because GM listed this thing at $644.28 when it was discontinued. VPI's online retail price is very good and not much more than I would pay as a dealer, but I'm not sure what they charge retail customers for shipping.
You may be able to find a tank repair shop local to you and end up in a better situation. Ours was a radiator and fuel tank repair shop but they closed up recently.
We use cheap tanks in our fleet and they come back within months leaking at the seams. Not every one, but too many do leak. The ones that make it awhile still only last a matter of years, where the leaking originals were upwards of 30 years old.
I’d get the Spectra then. That’s a decent warranty they offer.There is NOBODY around here who will repair a gas tank...and mine is probably beyond repair. (It has been repaired at least once.) The EPA closed all of them years ago. My options seem to be Spectra (3 year warranty) or Dorman.