1998 - 2002 2500's are the same body style and components.
There is no such thing as a 1991 Dodge Diplomat, last year for them was 1989.
1996-2007
1981-1993
This is just a guess but No, everthing changed between those two years.
1993-1995 with the same engine, A Dodge Caravan from the same years will also fit.
Yes, all interior parts are interchangeable from 2002-2008 model years. (With the exception of 2002 heavy duty models).
1973-1987
its impossible i have found out. mainly because dodge diesel's have been terrible for the last, i don't know... 35 years or so. GET A DURAMAX. Its all about Chevy baby.
What other years will my 1999 jeep soft top fit!
1995-1997
Cummins owns the engine. Dodge just offers the computer instead of cummins. Cummins is a private company it is not owned by Ford or Dodge.
1994, 1996, and 1997