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Use longboard truck bushings, same hole size and available in all durometers. A brand like Venom or Sabre will do fine. Available in barrel or conical.
They are for the Flex Stem and any colour will do, trying to ensure I get more years of use out of the stem due to having a buyer for my original Marin Team stem.
I will take a look at the longboard truck bushings, sounds ideal alternative.