If you want solid colour people have had success with using Land / Range Rover suspension bushes. I'm not sure of the spec but they're the right colour if a little narrower. They do work apparently though, to a point.
I have a 753 and used 3 of the rubber portion of a 2 inch test plug like this
They were a lot cheaper than the elastomer kit from suspensionfork parts online, though they probably don't work as well. I did buy an elastomer kit for a Quadra fork and it works well.
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