All I have to make this bracket out of is some 3.5" x 1" (+/-) C-channel that's a little over 1/8" thick. Gotta cut it up and make stuff . . .
I'm modeling this after the OEM transmission fluid heat exchanger's mounting bracket's footprint.
Starting with that foot that mounts to the passenger's engine mount, . . . . .

Whittle on it some and include a hole for removal of one of the engine's mounting bolt (it has to pass through the bracket in order to remove the bolt) . . .

Now, rip-up some of the metal to make the main plate of the bracket . . . .

Now, weld that to the engine mount foot and add metal to fill it all out . . . . .

Now, make the foot that attaches to the transmission's engine adaptor-plate . . . .

Now, weld it to the plate with a curved reinforcement gusset. It's curved so as to allow clearance for accessing the top bolt of the engine's barring-tool-port cover-plate . . . .

Now, notch the plate right there so as to allow clearance for the main down-pipe. Then add a reinforcement flange to that . . . . .

Then cut/drill the holes for the actual remote oil filter head . . .

All to be able to solidly mount the remote engine oil filter between the engine and passenger's frame-rail, right above the front differential . . . .

With that, I can now spec/get the hoses to connect the remote filter head to the engine.