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Assuming you have the short bed- If they are the wheel-to-wheel steps, he would have to have the crew cab 6'4" bed configuration. Not common on 1500s.
Also the wheel to wheel steps on the 2500 hang lower (longer brackets) than the wheel to wheel steps for the 1500.
If you have the cab length mopar steps than they should fit no problem if he has a crew cab. He will need to buy the running board hardware kit (nutserts) if he didn't have factory steps.
Thanks Everyone for your responses. I have the wheel to wheel ones. I was looking at his bed yesterday and the spot in front of the rear tires is a lot shorter than mine.