Thanks Mr. Martin for the part number.
Tube and fin looks attractive enough to me when it's that big and that cheap... I mean, this is not a high-performance application here, this is a "it just has to be better than nothing" application. I suppose the plate style doesn't cost much different, though, does it?
Now I just need to understand how to connect the hoses in the right place.
I'll probably stick a fan over it because the tranny can get warm while just idling at stop lights.