On mine, any pivot on the backhoe, except at the boom swing are plastic. I replaced the boom swing upper bushing with one made out of steel pipe. The lower one seems to be the same size. I cut a pc of 1 1/2" steel pipe about 7/8" long, good fit on the pin, but a little loose on the OD, or ID of the bushing seat. I had to find a large washer to keep the bushing from falling out of the bottom, seems the pin came out and the washer and bushing just fell out. I think I will make another one and put a small bead of weld around it and then grind it to fit better. I'm also looking for a bearing that would fit in case they go out.