All you need w/ that set-up, is six 4.5 gram clutch rivets and that helix. You have the springs and weights already. A Yamaha dealer can get you the rivets.
There's one on Grand Rapids,Mi Craigslist, but it was in November. Its a 51/43. You could give him a call. I run 8bu-10 at 49.5 grams with a gwg spring & 2 shims.