But I'm not familiar with an Omega enlarger referred to as a "DV" - can you clarify?
“Photography is a complex and fluid medium, and its many factors are not applied in simple sequence. Rather, the process may be likened to the art of the juggler in keeping many balls in the air at one time!”
Ansel Adams, from the introduction to The Negative - The New Ansel Adams Photography Series / Book 2
Well, sounds like maybe you have a bit of a cobbled together D2V? That is…sounds like a D2 with a later model variable condenser head, perhaps?
In general..the D2 series wouldn't use the lens plates from a D5/D6/Prolab. However, to my knowledge, the only turret that was produced was for the Prolab/D5/D6 series heads. So, it's possible that you actually do need the plates to fit onto your turret.
Check out the following web page. It's a great reference for what lenses need what plates / mounts. If you see your turret there…you'll need the plates they're talking about, and it'll show you what specific plates you need for what specific lenses.