Motometers with Die-cast housings, original Boyce plate, Beveled glass lenses, special glass tube thermometers, brass threaded mounting stem and stamped wreath or plain rims. By special order, you may substitute a specific emblem instead of the Boyce plate for an additional $10. Please specify emblem number when ordering. 

Senior size is 3-3/8" diameter and 5/8" Thread

Junior size is 2-3/8" Diameter and 7/16" Thread