Good Move. My B&M drain plug was garbage. It always leaked from the drain o-ring. When my CAD failed in some muck, the truck sank down to the drain plug. Water entered the pan and ruined my transmission.
As far as the donut magnets go, they go in the inside of the transmission pan. On steel pans, they just stick themselves. On aluminum pans, the magnet has to be epoxied down. I don't know why Mag-Hytec didn't attach them. Maybe someone with a Mag-Hytec can chime in. I would definately use them though. They do more for filtering metal shavings than the filter does. Good luck