You can trim the 1/2" diptube to whatever length you need to make it fit. You also want to make sure you get a fitting with a short thermowell (if you want a thermowell). BrewHardware sells one. I think it's called Sanke Fermenter Conversion or something like that. And you want a compression fitting that has a full bore so the diptube passes through it.
I have a similar kegerator I use for fermentation and it fits with room to spare. A Kegmenter should also fit but it will be tighter, height wise.
I have a similar kegerator I use for fermentation and it fits with room to spare. A Kegmenter should also fit but it will be tighter, height wise.