Bad idea, because all boots fit differently. If you are dead set on buying these boots than drive the 53 miles to try them on. If you haven't tried them on before, chances are that they aren't going to fit right. The chance that you buy online and get a boot the fits perfect is about 1 in 10 imo. And if you buy at a shop they can mend them a bit too.
But if you really want to buy online, I wear a size 12 shoe, and according to the charts that should be about a 32 on the mondo scale, but I wear a size 28.5 spk, so good luck.