My 25 year old, hand drawn blue prints, don't readily give up the information. What bolts hold are use in the rudder horn? Who sells the best AN hardware these days?
When I was building, I noticed that a lot of rudder horn holes for the tailwheel steering were wallowed out. My solution was documented on the 5/27/07 entry of fuselage page.
If you are asking about bolts used to connect the rudder cables, the plans call for AN3-6 Bolt, AN310-1 Castle Nut, AN960-10 Washer, and a MS24665-132 Cotter pin.