Just thought I'd share some of the info I've collected for spares for these units...

Oil seal part no:

Still available from toyota. Approx £35 for two.

Bearings:
Nachi Part number:The 50KB8301.
Available from Berkshire bearings (0163543449) £69+ vat each.

Or..Available from Bearing Source part number 03335660027 at £62+vat each.

Hope that helps someone..
Thought I'd whack it up on a post for future searches etc