https://www.ebay.co.uk/itm/164838169684I know you are after a Syncros post, but thought I'd give you the link anyway as maybe with the bontrager bars you have coming that it might work?
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Thanks for the link - I'd seen that - but I'm figuring that's a bit later than '92 '93 ish.
Looking at the Bontrager cats from that era - I can only see alu posts - but I may be wrong?