Not sure if it is too late but I just got last year's K2 Company bindings for a size 11.5 Salomon F22 boots. Bought L and XL to test both. Went with the XL since it gave me more flexibility with the adjustments. I was maxing out the settings on the L. You should probably be fine with L since you have a 10.5 boot, but might want to check XL just in case.
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