Tje Dewalt Adapter was made for the DW735/X and comes with the adapter and a Maglock Ring. Mag Round Adapter sold separately. Instructions for the MagRound Adapter are here

Putting the MagLock Receiver for Dewalt Planers together is as easy as superglue.  Glue the MagLock ring onto the main Dewalt Planer adapter.  Lastly snap the adapter into place on your planer.

2.5" version shown here:

4" shown here: