I'm not aware of any OEM rail system for the 2500, the interior bed walls are different than the 2019 1500 I had and you can't install those utility rails... I'm thinking it is mislabeled as fitting on the 2500.
Found a description here that says "This product requires: 82215286AB"... those are the utility rails for the 1500, not the 2500.
2009-2019 Mopar part # 82211356AB - Tool Box from WeRMopar, the leader in online MoparParts.
www.wermopar.com