I agree with Noble.
Study the enlarger first, and know the parts you will need, so when you look at it, you will know what parts are missing. If you are lucky the seller can find the missing parts in another box he may have forgotten about.

I have 2 enlargers that I am spending time and $$$ to gather the missing parts.
One was a good deal even with the missing parts.
The 2nd was bad, I should have offered the seller half of what I paid. Broken parts (expensive to replace) and missing parts drove up the final cost.