RuggedMade Log Splitter Pump Mount Bracket 11GPM, 13GPM, 16GPM Bolt Circle - Engine Side: 3.5" Hole to Hole, 5" Diagonal (PD: 128mm) Bolt Circle - Pump Side: 4-Bolt Flange, 2" Hole to Hole, 2.835" Diagonal, Length: 5-5/8" Fits most 11GPM, 13GPM, 16GPM Hydraulic Pumps Fits most Honda GX-type engines between 8hp and 13hp and some other brands