try fsa?
Or a Giant dealer, their OD2 stems come with a shim, presumably they end up with some spares in their parts bins after doing fitting adjustments for new bike buyers.
I'm going to try this - I've also asked the ebay seller.
I assumed I could just pick one up from Syntace but can't find it for toffee on their website.
@gbj_tester started
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try fsa?