Diablo, Dubro carries what you need. 4/40 is the way to go and the UCD.60 can easily handle the wight on the tail. All the stuff is listed as heavy duty and getting packs of a dozen is cheaper than buying individual packs. Here is what you need to shop with the part number:
Quanities are for pull/pull on rudder set up, duel ail. and duel elv.

6 - 4/40 rods threaded one end #144
6 - 4/40 threaded coupler #336 (this gets soldered on to other end of 4/40 rod)
6 - 4/40 ball links #259 (servo arm side)
6 - 4/40 spring steel quick links #304 (control horn side)
4 - Heavy duty control horns #866 (ail. and elv.)
1 - Heavy duty control horn #882 (rudder pull/pull)

Now on the pull/ pull setup from Dubro, The cone that spins on either side is a little long and limits the throw on the rudder. I found shorter CF ones online somewhere. Also you have to bend the threaded rod in the center, like a shallow V shape and angle it forward when installing so the push rods don't bind.
Hope this helps, you are going to love it! Joe