4 0 Cummins X15 Rocker Arm $600 USD Used Cummins X15 Rocker Arms. It will be sold as a pair. Rocker Arms came off Cummins X15 Engine with low mile. P/N : 4393087 Visit our Site for more Parts :,... ConditionUsedPart Number4393087 MLS Number12139348CategoryRocker Arms Last Updated7/13/2023 LocationMineral, VA, US Sold ByInside Auto Parts (888) 693-___ SHOWNUMBERCall Seller Email Seller Save More Info