Since this op I've seen 3 different used pull hehind mowers on FB Marketplace. Mech the one I plan on using is a vertical shaft. The 16 hp briggs in my old Bolens is a horizontal, same l head configuration. Your son might like these pics. With, and without the cooling shroud. I love the farmer applied crack repairs. I'm fixing to copy his deck roller replacement. His method will replace them all for around $25.00. New ones are available for about $150..