Moogerfooger Rack Mount Kit

I was wondering why on the Moog Music website it says the rack mount kit can “hold 4 CP-251’s”, when they are clearly larger than the other units.

I mean, if it can hold 3 normal foogers, like the picture shows, how could it possibly hold 4 units that are larger to begin with?
It looks to me like the rack mount kit could probably hold one CP-251 and one other fooger like the ring mod or delay.

The Moogerfooger rack is like two of these stacked on top of each other. Fits four no problem, or one MF and two CP’s.

the 251’s are actually considerably smaller than regular stomp-type moogerfoogers.