The B-25D was identical to the B-25C, the only difference being that the D was built at Dallas. Features included R-2600-13 engines, external hardpoints, and the ability to carry fuel in the bomb bay.

B-25D Gallant Warrior at the Allegheny County Airport circa 1988
(C. Reed)
Accurate Miniatures 1/48 scale B-25C/D kit
An excellent series of walk around photos of a preserved B-25D (French language site)
Details of the crash of B-25D 43-3488