This Syzr Cr-Mo pedal system has the RIGHT pedal set up with a 5mm (shorter) leg length discrepancy, but it can be set up to utilize just a 2mm or 3mm shim.  As shown in the photos, the right pedal is currently set up to use BOTH the 2mm shim and the 3mm shim, thus compensating for a 5mm leg length discrepancy.  Removing either shim will decrease the discrepancy by the shim's thickness.