Wayne,
You can still buy new spares from Boxford. They no longer make the manual lathes, but they have a stock of spares. Quite expensive, but handy for the odd part, and very helpful too.
I have an AUD MkIII and have recently bought spare thrust races for the cross-slide feedscrew. I have occasionally bought spares from other suppliers, but they don't seem to last as long.
www.boxford.co.ukMarcus