Been through my list of 86 casting references, but couldn't see it I'm afraid!
I guess you don't know the axle manufacturer, or you wouldn't be asking. Perhaps post a pic up, I may be able to assist from that (different manufacturers have different casting shapes - some have fins, some have deep bosses, some have castings marks etc)
Thanks guys. Managed to get bearings by measuring the old ones.There were no numbers on the larger bearings!!!The trailer is unplated and a bit of a mystery.It had mild steel dumbells which rotted through!!!All now replaced with proper alloy.