Where can I get this part?
 

I picked up some new 3racing front knuckle(?) I found that I was missing the bottom kingpin that holds the nuckle to the hub.

I noticed it was a kingpin on the other side of the car, but in the manual it shows a coller (part 116) and a 3x8 button head.

Any ideas?

I think I used a collar from a servo mount and a normal 3mm screw - the free bag of junk you usually throw away when buying a servo.