Hi Quicksilver,
I had the same problem, the ball, spring & bolt are available ex Honda but not the special nut. Buy 2 bolts, the spring & the ball, cut the threaded section off one of the bolts (this leaves just the shanked section of the bolt & bolt head), drill and tap a hole into the bolt (M8 X 1.25 I think) and presto you have all the bits to make it work. I have assumed the knuckle & leg are OK.