Where would the car builder be without EBay? I can't imagine what a pain it must've been in the "good ol' days" to obtain random parts; no wonder kit car shows used to be so numerous and busy.
My latest online-find is a track rod-end for a radio-controlled car. In my case, alongside some rod-ends, it serves as a stay for my throttle-cable mount.
Of course, it doesn't need to be adjustable or indeed made with spherical bearings. The parts are quite convenient however.
And so, I've just wandered into the house having finished adjusting the throttle cable. It all seems to work, albeit it is rather closer to the end of its adjustment than I would have ideally liked.