Footswitch for RD 100 head...help?

Does anybody know where I could get a replacement footswitch for my RD 100 head? I guess it would be a two switch pedal, one for REVERB and one for DISTORTION or channel switching...does this even exist? The only replacements or originals I can find are the Reverb/Vibrato, Reverb/Phaser models. Any help would be appreciated. -b