Here's a couple of choices for number plates:
Click
The one on the left is from an 01RM125/250, the one on the right is 96-98.
As for the tank/shrouds, etc., it takes some modifying. To go full-on RM plastics and seat, you will have to modify the subframe, or procure an RM subframe and modify it to fit the DRZ, etc. I never went that far with the project, so I don't know exactly what needs to be done. The front plate by itself sure does clean things up a lot, however.