Has anyone got any COB sized all in one brushing/knee boots? Could swap for FULL size

[Fifty Bales of Hay]

I've got some all in one brushing/knee boots in a FULL size that are too big for my pony, and ideally I'd like to swap them for COB size - so wondered if anyone had any that were too small and needed bigger or wanted to sell me some COB sized ones of the same type?

Thanks.