You could get rear pto with a SGT but it had to have the cat 0 hitch.
You could just get the cat 0 hitch and not the pto.
Or you could get the bagger adapter kit as seen here and none of the above.
http://www.partstree.com/parts/cub-c...apter-package/
I'm thinking someone removed the rear pto from your machine by the looks of the rear cover plate.