I have a Beseler 67C that I bought new in the late 1970s.
I used it happily for years with a condenser head and below the lens filters.
In the mid 2000s, I acquired two different dichroic heads, two different power supplies, and a plethora of accessories.
The compatibility between versions is extensive, but not complete.
Beseler is still around and, with some patience and a willingness to use the telephone, they can answer a lot of questions.
FWIW, there are no condensers in my dichroic light sources - just changeable diffusion light boxes.
And the only serious compatibility issue I have ever encountered was when I tried to use the wrong power supply with one of the dichroic heads - pooft went the halogen lamp.
Here are two views of my enlarger from 2008 - each with one of the dichroic heads:
Note the single, fairly massive column - they haven't been built that way for some time.
One of the members here put together a glass carrier for the 67 series. For some, it might make a difference that Beseler never made one.