I took those part numbers to Toyota, but they no longer exist.
On the Toyota diagram (which is identical in all other parts!) they have revised the two seal numbers, 90311-47010 is now 90311-47013.
The Toyota garage did tell me it was a common part on several other vehicles.
When I did the nearside, the part number of 90311-47011 had been revised to 90311-47012, this was identical to the old seal and has been fine, so I suspect that its the individual seal I've fitted. I've ordered one from the dealer which will be here on Tuesday, and the car is going in on Wednesday. We're keeping all the seals so we can compare them.
The two seals are different thicknesses, maybe because the diff is offset and the rh has a longer housing unit attached so theyve designed a different seal for some reason.
Cheers
Pete