At the present, I do not believe we have the actual individual pilot truck components available for the Railking Berkshires, …….we haven’t gotten to all the Railking Berks yet, ….however, the whole pilot truck is available, there are two listed for Railking Berks, look closely at the pics, and pick the one that best matches your application. I see a difference in the mounting hole ( not the pivot arm ) between the two. One truck has a defined round hole, where the other has a “slot” …here’s the pics with the part numbers, both are readily available at mthpartsandsales.com
Pat 
