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I have an original heater core seal from a ‘78 Aspen that I removed from a customers car. The core was in poor shape and our local radiator guy has recently passed away. The other shop I deal with wanted over $300 to fix it so my customer purchased a core for an 80’s Fifth Ave (I believe) and I made it fit, but the seal wouldn’t work with it. This is a used seal/gasket that is in good shape. If anybody wants it they can have it, just pay for shipping. Send my your zip and I will get a price for you. Thanks for looking.