There really were NO rear pto powered attachments or implements made by IHC or MTD or CCC for that pto. That pto was actually a spin-off of the rear PTO from the FARMALL CUB and Cub Lo-Boy. The Cub Cadet rear rototiller used the front pto and a long L-O-N-G belt to provide power the the rear of the tractor. Can't remember who it was but somebody built a modified 38 inch timed 2 blade deck off an Original to attach to the CUB pto and work properly. I saw it at a RPRU but didn't pay a lot of attention to the details.
Now on the Super garden tractors, there was a finer spline 15/16 inch internal spline pto available, electric clutch, 2000 rpm, and think it was DANCO who made a 42" cat O 3 pt hitch rotary cutter, and a 42" rototiller also cat O, And if you live near Osh Kosh, Wi. you have a Cat O 3-pt mounted yard sprayer with a pto powered pump from that rear mounted pto. There were several companies that made attachments for the pto on the Super's, several tractor brands had rear pto's but they all struggled to come up with a standard speed and direction of rotation.