My old heat exchanger has an internal leak and is not repairable; so I need a new one.
The previous one was 3.25"x16.5" with 1.25" in/out for the engine - with both ports facing the same direction and with no radiator cap.
I can make almost any size work, and this is not for a "standard" application. Up to 5" diameter and up to 22" long.
Let me know what you've got and how much you're asking.