(Used) GM/Chev (HD) 6.0L, ENGINE ECM- Part Number: 12613264, Serial Number: 86YPUHR171990412, HDW Number: 12589161, 2 Rectangular Plug with 80 Pins each, Reference images for condition. For more information about this item, give us a call. We ship Worldwide! (CRG HEAVY TRUCK PARTS) 929 W PULASKI HWY, ELKTON, MD 21921