Dustin - IH never actually made any attachments or had any attachments made for the rear PTO on gear drive Cub Cadets. I forget the name of the company that made a gearbox that corrected the direction of rotation, I think it may have been HUB CITY or something....but it turned the wrong way and at slower RPM, and with a different size & spline count than the ASAE standard so it was not accepted well, even by farmers.
The rear PTO option on Super GT's like the IH 982 and later SGT's was fairly popular with a wide selection of Cat. O 3-point attachments avail. like finishing mowers, bush hogs, tillers, etc.