[Farmall] Hard to get parts

[Robert Luscomb]

Having problems finding parts for my 50' cub w/adjustable front office. 
In the parts manual, group #14 item 30, bushing, steering knuckle post (qty4) part#: 350 761R
Item#:6, arm, steering knuckle arm RH, order package 355 429 R91- s/n 138485 & below, this one has the two two set screws on the sides not the single bolt/nut. 
Also incase I haveto replace the whole knuckle (p/n: 350 769 R91. 
If anyone knows where I could locate those parts, I would really appreciate it. 
Robert
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