Hi Ed, I don't believe that there is such a thing as a repop gas tank for a '57 - or for a '60 , or any of our 300's. If I am wrong, someone please correct me. I also really need a '57 gas tank in real good condition ( for a Club member friend - hi, Danny! ) . Anyone have one ? Ed, if your tank is just dirty, or scaly, or full of crap, the way to go is to drop the tank, flush it out, rinse it out real good with a solid stream of hot water... I have used a pressure washer inserted in both openings. Then get yourself a POR-15 gas tank sealer kit from RestoMotive Labs., P. O. Box 1235, Morristown, NJ, 07962-1235. 1-800-457-6715. Fax 201-887-8007. http://www.por-15.com/ Follow the directions - use the prep solution, let it dry good ( I use an electric hair dryer and run it for an hour or so attached to the gas tank filler tube) . Then put in the sealer, slosh it around so it covers all areas, and drain out the excess. (use gloves !!! ) . Let sit for 5 days and reinstall. This stuff is amazing - it will seal pinholes, it will seal in whatever flaky rust there might remain , and it will renew the inside of your tank to last forever ! I have used it many times always with A-1 results - even on some VERY crappy tanks ! Again - anyone have a good, spare '57 tank with no dents or external damage ? Good luck John