I'll have to take a photo but to do it that way would have required removing a pretty big section of the side mounting plate because it both obstructed sliding it into place and tightening the mount correctly. In the end removing the 1cmx1.5cm chunk of metal on the outside of the dumbirons just made more sense... that and the galv had cracked already when I was trying to coax it into place the first time.
Not ideal, but they are both aware of the issue now so hopefully (fingers crossed) they make the appropriate changes to their next versions so that they do work together. Both are fine products on their own though and very well made in general, so far I'm mostly happy with everything. (except that one vendor did not send me the right doors, which is a major pain).