When you buy a Onefinity Standard Series, you get a 65 mm mount for the Makita trim router. As an optional accessory, you can buy the:
… just to show how such a mount looks like.
Note that these mounts are not interchangeable with those for the Z-20 Z assembly, which are a bit bigger. As Scott already said, with the Elite Series, you can choose with which mount you order it, 65 mm or 80 mm.