(USED) 2007 Freightliner Columbia 120 - Tandem Cutoff - Make: Meritor. FRONT DIFF SOLD Model: RT-40-145 R-SRS Serial Number: FOR00049269. Hub Bolts: 10. Brake Type: Air Wedge. For more information about this item, give us a call. We ship Worldwide!. (CRG HEAVY TRUCK PARTS) 929 W PULASKI HWY. ELKTON, MD 21921.