Fail safe for 2 wheel system, dust-tight box, mtg flange ea side along the lg, mtg center 3.000 in. By 4.562 c to c, 1 electrical connector p/n gs02-20-29p-111 fscm 91577 located on front panel, o/a dim including connector and mtg flange w, 5.625 in. Lg by 3.500 in. H by 5.125 in. W