And there is very little space so you need either the original BSA tool or a tube spannar to tighten / loosen them.
Sorry about the LH thread I should have mentioned it, having just installed new rear bearings myself.
There is also a hardened thrust washer that fits over the bearing carrier sleeve...If that's missing the wheel will lock up when the nuts are tightened.....
It's best to get the manual and parts list if you are unfamiliar with the bike...That way you'll have a chance of sorting it...
I believe Henk has them all on CD for a reasonable cost...Ian