spare parts for a de vere 504 enlarger.

Hi, I'm trying to track down any spares, either new or second hand for de vere 504 enlargers. Specifically 250 switchstabs and transtabs, also timers, however anything else maybe of interest. I've checked out a few prices at the main dealers and am just wondering what else is out there. Any help/information would be greatly appreciated. Many thanks, Christian.