Knot sizes

Thanks to Teiste's steam method, TSM (as I call it) I will be restoring both of these brushes this summer and I was wondering if anyone knew the diameters of the knots so I know what size to order? Also what is the best epoxy to use on the knots?

The Surrey / VdH brush has a knot around 22,5 mm.I know that since I restored one of those brushes with a 22mm Finest Badger knot.