Umount 10631 Z-Turn Universal Mounting Bar 48"Umount 10631 Z Turn Universal Mounting Bar 48" This mount attaches to zero turn and stand on mowers by setting the bar on the caster arms (35 46. 5 arm spacing width) and strapping it with the provided 3 8 thick steel plates and hardware. A 10778 (9 drop) receiver needs to be purchased with this mount on almost all commercial mowers. Note: If your Z turn has a hitch receiver already, you can get the 2 hitch (10441) or 9 drop 2 hitch (10778) instead.