I had a local shop install an Aguilar OBP3-SK/PP in my Euro 5 as it had passive controls and active pickups. Everything went fine, But I need a concentric(stacked) bass/treble knob. Ive looked on all parts, warmoth ect and I cant fine one that looks like the stock ones. I dont want one knob looking different than the others. What have you Spector owners done in this situation? Can I find a complete set with three normal knobs and the one stacked that are matched ???