I have had the darndest time trying to find one of these seals. I have tried the vintage AC retailers to see if they could assist with either material or further information without much like. I think I have finally located some foam that will provide as accurate of a reproduction as possible. If someone has one they can get some measurements off of for me I would appreciate it. If you have one available and could get the thickness of the foam the length, width, and centerline of the heater core holes I would appreciate it. Thank you, Brian