This investment-cast satinless steel seat hinge from our friends over at Biltwell may just outlast the rest of your motorcycle. It's fully polished after casting, so you can get that nice sparkle between your legs at high speed. The weld-on bung is left unfinished and is larger for increased durability and more weld surface area. Weld this puppy to your backbone (the bike's that is, although if you send pictures of it on your backbone, you'll probably get some free stuff...), Bolt up your favorite seat and you're off!