The supplier of supposedly-better-than-stock bushings for a m/c project says he hasn't got 'em and won't have 'em for a long time.
I have an extra bit of oilite here that would make two such bushings, if the number of mistakes is less than one.
I don't know what the commercial ones are made from - is it likely to be oilite? Would oilite be ok for this purpose?