The pedestals are designed to fit a chassis member of 20 mm wide by 25 to 40 mm deep, and a between chassis side member measurement of 170 mm. They have been designed to be used in conjunction with 11mm outside diameter polished axles, with a journal length of 44 mm from the inside (back) of the wheel, assuming back to back measurement is 119 mm. The ends of the axles should not have more than 1 to 1.5 mm end clearance, 2 to 3 mm total. The clearance must be no more than stated or the top-bearing shoe could move out of the pedestal body. Please note, this item is not suitable for passenger carrying vehicles Set of 4, available in either rust or black