As far as I know, nobopdy makes a number palte bumper for the Warrior because (in their words) 'Nobody races a Warrior'. I ended up cuttinga regular plate to fit in behind my standard DG bumper. If you have a DirtScreen bumper, you could cut it to fit in front of the screen, that's what most of the pros do. The numbers run off the sides a little, but it's allowed.
