Heat Exchanger off J & T 6-71T (1976). Tank has some damage but the core and oil cooler are both fine. Also have fuel cooler available. New cores alone are around $1K but you can have it all for $250/best offer!
I still have the tank with related piping, the oil cooler that is mounted in the bottom of the tank and the core which is presently separate from the tank. I also have a fuel cooler. The tank has a some damage where the round end of the core is sealed by the O rings. Perhaps it could be repaired by someone more resourceful than me, I don't know. The core, oil cooler and fuel cooler are all OK as far as I can tell.
