[juse]

They are spherical bearings or rod ends that you mean. People call them rosejoints, uniballs etc. by the brand name. Try to search the web with words like those or manufacturers like Aurora, National, SKF,...
Easiest way to make a droplink or a "dogbone" is to use a male and a female rod end bolted together.
Good rod ends arent cheap. And you should study the load ratings of differend ends capable to handle the forces your front suspension creates. I am not he one to advice you here, maybe someone knows mats and physics better?
Use only bearings with a PTFE liner, or not liner at all (grease needed). The cheapest bearings have brass liner in them which breaks soon under heavy loads.
J.