Transmission Cooler

If you're looking for a stacked plate cooler, check out Tru Cool coolers (L7B, M7B, and H7B). They're the same as the B&M plate coolers, and are usually a little less expensive. They have them with different fitting sizes too. I've several good luck with the few I've bought.

Tru-Cool LPD Transmission Oil Coolers. Protect Your Investment. | Tru-Cool
I am running the H7B with my 408/727 & 3000 stall PTC converter (and not thru the radiator). That unit cools like nobody's business... an it gets HOT down here in Texas!