Is it possible you are looking for a ball mount like the part # C45036. The ball mount platform is somewhat L-shaped.
I attached an article that details how to pick out a ball mount that will allow your trailer to be towed level. view full answer...
For your 1984 Dodge Ramcharger we have rear bumpers like the chrome part # 21007-92400 or the black # 20000-92400.
We have a few other similar options as well which you can see at the attached link. view full answer...
The Derale Stacked-Plate Transmission Cooler # D13402 that you referenced is an excellent choice for a transmission cooler, and as long as you have the room for it in front of your radiator for this cooler then it should work well for you. This is a stacked plate cooler which is one of the most efficient style coolers on the market.
The dimensions of this cooler are 13 inches wide, 6-7/16 inches tall and 2 inches deep. view full answer...
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