SA240D - 40mm square section. New type which now incorporates Stud/nut.

40mm square section ( Drilled) and center hole to center hole on the box section is 125mm. Distance from one stud to the next is 70mm centers. Distance across studs (PCD)  is 100mm Centers

NB. This will directly replace the older style where the studs were part of the hub with separate nuts.