Starter part number cross reference information for Dodge Cummins engines, a

1988-1993
Cummins 3912084
Denso 128000-4910
Lester 17215

1994-2002
Cummins 3921682
Denso 228000-2290
Lester 17548

2003-2006
Cummins 4090084
Denso 428000-1190
Lester 17892

Lester is generally the standard interchange reference number between various manufacturers. Cummins part numbers are generally the most expensive and are subject to frequent change. Denso is the OEM in most cases.