The SO3 came with the adapter that @Ed.E linked to. If you have a Z-Plus you can buy a 66MM router mount separately as well but the adapter works very well. The original SO3 came with a 69MM router mount for the Dewalt 611 router. I have the Dewalt and it has been flawless. The C3D router as well as the Makita tend to have lower bearing problems and the brushes get ate up quickly. Lowes and other sell the Dewalt for about $150.00. An added bonus for the Dewalt is the body is longer so you can cut a little bit lower if required. The C3D/Makita are good routers but for an SO3 the Dewalt is better.