Magnet Kit - Hayes 12" x 2" & 1-5/8", Prior to 1987. Magnet measures 2-11/16" diameter, the center hole is 1/2" diameter and the mounting hole is 7/16" diameter. Center to center of the mounting hole to the center hole is 1-1/2". Magnet is 7/8" thick. This item has been discontinued by manufacturer.