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@Thrustvector
The SQR block has a 'large bands' option, which is for seatposts up to 40mm diameter, but I guess that's still a bit small (and you'd have to pad the seatpost out to a more circular shape)? You might be able to hack some shape together that fits the seatpost and the block - if you look at the instructions linked from the SJS page there's an exploded drawing on there ( https://www.sjscycles.co.uk/luggage/carradice-sqr-quick-release-mounting-block-for-sqr-saddlebag-uplift/ )
Is it a carbon seatpost? I'd be quite leery of tightening the support block on there - I've head various reports of people having failures this way.