There isn't really a gasket for the knuckle to spindle I have seen. I just use rtv. Works fine.I may have found a source for the washers: Redbarncustoms.net.
I'm going to hopefully call them tomorrow.
I can't seem to find the knuckle to spindle gaskets now either. I'm going to ask red barn when I call. Otherwise, I may just end up using RTV.