Derby house boots? Sizing

[ahlam1399]

Does anyone have these boots? What do the foot sizes come up like? Sometimes I'm a 5 & sometimes 6 - 5.5 in Ariats!! They are out of stock in the 6, is it worth risking the 5 or do they come up small? https://www.rideawaystore.com/en-UK/Derby-House-Classic-Long-Riding-Boots/r5048476.htm?colour=Black

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