AGS30R - Replacement O'Keefe & Merritt knob only with 2 screw for mounting of trim ring RED - standard. AGS30B - Replacement O'Keefe & Merritt knob only with 2 screw for mounting of trim ring BLACK. We have vintage classic retro stove sales parts restoration for O'Keefe & Merritt Rheem Wedgewood Tappan Roper Chambers Magic Chef Western Holly Gaffers