Take your rear wheels and drums/rotors off. Measure from axle flange to axle flange. Call Moser and order one without spring perches installed. Swap brakes, install, set pinion angle and weld up perches. I was quoted 1800.00 plus freight, comes with spool, 35 spline axles, green bearings and choice of ratio. Don't forget to shorten driveshaft.