The supplied hardware kit is off the shelf supplies packaged up so you won't have to go looking for all the hardware as you discover what you need.

as for the rudder pull/pull arms being too long, the metal screw is NOT the part you move back. You still put the screw throught the hard point, but you drill holes in the two black control arms in line with the hinge point. then trim away the excess control horn with a dremel or such.

The Nelson arms are for aileron and elevator.