4th gen running boards on a 3rd gen?

[Benjamin Knight]

Anyone know if 4th gen running bolt on a 3rd gen with the same size bed without modifications

 

[Mr.AK902]

Anyone know if 4th gen running bolt on a 3rd gen with the same size bed without modifications

No. The 4th gens use a different mounting style then the 3rd, they are mounted via 3 brackets with 2 mounting points each, all of which are through the rocker panels.