Good eye, I believe they are nylon filled with molybdenum disulphide. I’ve also seen them made from Delrin and other materials too (including aluminium).
The clamps can be made to any size, just turn them on the lathe, bore them to size and then mill the bolt holes, thread, cut them in half and drill the top halves as through holes. I think you can probably get them pre made as they are a common item.
I’ve thought of them for my 940 as I think the ARB is still shifting in the poly mounting bushes.
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940 B230FT
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