I had one of Beseler 45 series enlarger with this color head. I dismantled the enlarger when the electric motor died. Not sure if I still have the lamp or not, but it should fit the 45 series enlargers.

The universal color head would be too large for a 23 series enlarger.

Not sure if it would fit a CB7 as my CB7 has a huge dichronic color head. The head with the large hose and cooling fan. Kind of looks like something out of a sci-fi b movie prop.