Costina, yeah the offside is the damaged side. Massive excess wear in the Hub Carrier where the Bearing seized and caused rotational damage. The new bearings I bought just slide in and have space to rattle in situ!

I'm a little embarrassed by my lack of knowledge

The hand written parts receipt (from previous owner and 13 years ago now), despite it listing my rear end parts as '4x4 1990 Sierra Cosworth' might have been a 2wd Cosworth (I have solid rear Discs, not vented like the 4x4 has).

However, if I am understanding the replies correctly, it makes absolutely no difference whether I buy 2wd or 4wd Cosworth Hubs and Hub Carriers because they are identical?

Paul, your Hubs you have... are they from a Cosworth 4x4 or XR4x4 ? I don't think the latter will fit, but i'm not sure?

I think I have added some confusion, sorry. Just so i'm clear on terminology:

These are like the Hubs & Hub Carriers I have:

https://www.google.co.uk/search?q=co...gjRMqYcOKaM%3A

I thought the Hubs were called Stubs. So I think i'm wrong there. So there's nothing wrong with my Axel Stubs.

The Hub itself is apparently also damaged, but i'm not convinced. The new bearing slides onto the Shaft 15mm then gets tight, as I expect it should do, and will need persuading into place.
Is that an issue ? There is light scoring and discoloration on the first 15mm (that it slides easily on) due to where it got so hot.

Sorry for the long post, and thanks again to those replying with help.