Quote Originally Posted by Robert
Best website for part numbers for Omega enlargers is likely:

http://www.khbphotografix.com/omega/

Just do some clicking until you find the enlarger model you're looking for. They even stock parts but they charge pro prices if you know what I mean.
I'll second all the comments made about KHB. I found parts for my Omega D2 quite easily through them. Just brace yourself for the price.
They are very helpful and friendly though, and advice or referrals are free.