Omega 6.5" Condenser for D5 Enlargers is a 6.5 condenser for D5 (Correction for the DV2 lamp house-which is attached to the D5 chassis). What's the difference- The 472106 are the primary condensers. It should not be removed unless needing periodic cleaning as all lenses can become scratched, so it should be handled carefully.
Note:
The two curved sides of the condensers face towards each other