AM-51D - Vivotek ADAPTOR PLATE FOR 4IN OCTAGON &SINGLE GA Adaptor plate for 4" electrical octagon box & single gang box $71.68 $39.82
AM-51E - Vivotek ADAPTOR PLATE FOR 3.5IN OCTAGON&SINGLE G Adapting Plate, Ø116 x 11mm, White $71.68 $39.82