Efter lite googlande fick jag fram detta:
The speaker size you want up front is 6.5" or 16.5-17cm. You also need to be aware of the mounting depth, as anything more than 54mm needs a spacer to fit.
For example my components when fitted need a mounting depth of 70mm, so will be getting a 20mm spacer.
Audison Audioquest Autoleads E.A.D Focal Nakamichi Odyssey STP