Quick Question for Tannoy Legacy Arden Owners

Hoping someone can help.  I have a pair of Tannoy Legacy Arden's on order.  In the meantime, I am having stands built for them, but I can't seem to find the dimensions of the base ("plinth"?) that is inset, and somewhat smaller than the actual speaker cabinet.  Need to know that measurement for the new custom stands.  Does anyone know it, or could one of you owners please take a quick measurement?    Many thanks in advance.