I assume you're referring to the front wheel bearings. They are both Spitfire units and you should be able to get them at any parts store or on line at Moss Motors, Victoria British, British Parts Northwest, Rimmer Brothers, etc.
If you're talking about the rear bearings, the outer bearings are: SKF or FAG 6206 2RS; NSK6206VVC3E-CSR1S5; NTN 6206LU, NTN6206LB
FYI there are parts cross reference links and a lot of technical information here:
http://lotus-europa.com/manuals/