ISR is Industry Standard Rails. I had a 2007 Dodge with the Reese rail kit. Took it out when sold and now it's in my 2011 Ram. Also have Firestone No Drill Airbags and did the same thing. Guess the frames have not changed in the models. Dodge/Rams have full boxed frames so special fasteners have to be used. Kind of like rivets bolts, so they were not reusable. I have a IRS Superglide 18K hitch
2022 Renegade Super C
2020 Ford Ranger 4x4 Sport