Needing help with bolt size had a bolt shear on the disco 1 it was one of the bolts holding the disk on to the hub and it destroyed the heads on the bolts holding the stub axle to the swivel housing. so needing to replace bolts.
That one bolt head smashed the disc destroyed the hub where the rear seal sits. So if any one can tell me the size of the bolts holding the stub axle to swivel housing.

You may find the size and also the part number in this link. Allbrit MG ROVER & Land Rover Ersatzteilkatalog

17mm head think they m10 x 40mm or 30mm