I had a pair of Atlas electro-couplers that I was going to install, but the larger coupler boxes don't fit in the chasis. I got out the TMCC version of this switcher, which comes with the electro-couplers, to compare.
First, notice the space around the coupler box on the DC version is just black, but painted zebra stripe on the TMCC version.
I also noticed there is an extra piece to the DC assembly.
I'm guessing these two different arrangements are to ensure that there is enough space for the electro-coupler on the TMCC version, but also to ensure that each coupler rides at the correct height.
Anyways, I decided to leave this model with just KaDee couplers. Next upgrade is to change the TMCC version to DCC, so there I will have a chance to wire the couplers to the LokSound board.