Try here...
www.steeringclutch.com
Part # for Sale at Machinery trader has listing for that #
steering.com does not have any they are switching re builders
machinery trader said computer glitch a couple of messed up returns
so still looking
Here are a couple of shops that all they do is friction linings, maybe able to give a quote on the phone. I have used Clutch and Friction in Norwalk, Ohio
http://www.allfrictions.com/productsservices.html
http://www.rowlandcompany.com/supplier-distributor-friction-wear-materials-products.html
http://artspartsllc.com/ was Clutch and Friction