2017 Peterbilt 579, Truck Tractor, I Beams, Fits to: Peterbilt 579, (Used) 2017 Peterbilt 579, AXLE BEAM- Make: Meritor, Model: MFS12E122ANN40, Material: Steel, Part Number: B05-6042-017000000, Serial Number: MON02734355, For more information about this item, give us a call.We ship Worldwide! (CRG HEAVY TRUCK PARTS) 929 W PULASKI HWY ELKTON, MD 21921, Truck Year 2017, VIN 1XPBDP9X7HD363761, Axle Make Meritor 1XPBDP9X7HD363761