Those are the original Z-Broz arms and due to the size of tubing they used for the pivot you either have to get the bushings from them, if they still support those arms. Or have a machine shop make you some more. Some one like Bparks could likely whip one or a few out for you if you got him the dimensions.
From my understanding the cost of making their own bushings is part of the reason Z-Broz changed their design to use the stock tubing size and thus the stock bushings. So they may well not sell these anymore.
If you don't have any luck anywhere else, PM me. I have an old used set of wide hill climb arms that I was saving to use once a year for our local hill climb that I could possibly be persuaded to pull a bushing or two from.
