We sell reproduction PTO clutch sets for all round nose and 500 series Cockshutts &CO-OPs.  Also have some other reproduction parts as well as many used parts.  Email your request to snrdrill@msn.com or call 724-253-4285. Evenings are best 7 days a week but try any time and we'll get back to you. Located in western Pa. Irv Buttray