The sticky at the top of the page parts sources. Florin and Regal have all ways been ok if you want after market,and Cat has a lot of stuff for all the u series models.
Ray
http://www.tractorparts.com/steeringclutch.htm
The newer style steering clutch friction discs have a bronze material that is not supposed to stick as bad as the old type with organic/asbestos friction material bonded or riveted to them.
Get the replacements ccjersey is referring to.
that is General Gear John nd Robalyn are great to deal with 208 342 8911