MS&SelcMachn=Alternative PTO FRCL&SelcModel=(UNDEFINED)
www.allpartsstore.com
CS53516 Driveline; W/ 7" Friction Clutch
www.allpartsstore.com
The first link goes to the index page of A&I's selection of generic shafts with clutches. The second goes to a choice I made of one of those offerings. That shows the details of that particular shaft with a collapsed length, maximum safe length, configurations of the implement end and tractor end yokes and other info.
An understanding of what you need and careful selection should get you what you seek.