They fit masses of fords so will still be able to get one from some ford car, if not cossie, they use a different colour on some assume it must be the thickness, it's just there to act as a pivot point where the rod from the servo/pump passes through the pedal, it sits in the cup shape on the rear of the brake pedal that has the hole for the rod through the centre, maybe scrappies or even make one out of aluminum or delrin easy enough.
tabetha