RE: exhaust system for my 03 dodge
That should fit. I don't know why they would have different part numbers for the two years. The only difference that I know of is that in 04 they started putting a resonator on the tail pipe.According to other exhaust sites like flowmaster, the parts are the same for 02-05.
As far as I know,the only difference in kits for crew cabs is you get an extension pipe to go between the cat and the muffler. The muffler and tail pipe are mounted in the same position under the bed on both.
I wasn't willing to come up with that much money for a cat-back,which is why I just bought the muffler I wanted and had a shop install it and make the tail pipes. It ended up costing me a total of about $230