I need a good suggestion for a rear mounted, rear discharge finsih mower for my Kubota model BX2230 please. I think it is a CAT 1 3PT hitch PTO. The tractor's rated HP is 16.7. The book specifies the rear PTO as "SAE 1-3/8, 6 dplines" and Revolutions as "1 speed (540 rpm at 3068 engine rpm)"...