Good Morning,
I have a 2nd M1161 a 2012 very clean unit but the starter solenoid was fried due to a small relay in a cluster above the brake pedal. I pulled the started and it has absolutely no markings on it. My son, through contacts, is arranging to buy one thru folks in either Paraguay or Brazil. The differentials are FoMoCo or, I presume Ford Motor Co. There's a long number, not at hand, on the rear unit and the markings SYNTH 75W140 The differential's lubricant. Another mark is CAV21 However the front differential number is obscured by frame structure and is a CAV20. The M151 I have has interchangeable front and rear differentials...that may be too much to hope for here as per the "20" and "21" CAV numbers. I'll reply to this list if I have any results on the mysterious starter.