From my research into this, I found at least 3 bellhouse patterns; man trans narrow for early 2.6 in Gen 1's, narrow auto trans pattern for 83 to 86 Chrysler 904 trans only, and later wide pattern for turbo (and Starion) motors in both man and auto (4 speed OD) forms. What I'm not sure of is whether the wide pattern non turbo 87 and up 4 cyl A/T is the same as the 3.0 V6 A/T pattern. All the 2.5 TD's have the wide pattern IIRC.
The later trannys have electrical input from the ECU for the gas engine that may or may not work with a diesel ECU.

83 mitsu flat bed 2.6l weber, 88 auto tranny, 2" body lift, 4.625 LSD, 235/85-16E mudders (33 x 9.50).