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My RAMBO has 1 longer wire pair and two shorter ones or the endstops.
The longer one has to be for the Z Axis since it has to run further, but I can't see how to run the X Axis wire so it will reach the sockets on the RAMBO.
I have my RAMBO mounted on the inside per the PDF with the stepper drivers to the bottom.
After the wire exits the extrusion, it has to go left through the slot, which is away from the electronics compartment.
AFAICS It then has to go around the TSlot support before it can be routed into the electronic compartment.
when I do this, the wire is about 2 inches too short to reach the X endstop connectors, even with the door closed.
Am I missing something here?

The end-stop wire for the X axis should enter the electronics bay through the same slot as the power supply wiring does. If it's too short, how does it compare in length to the other "Short" cable?

I had 2 short pairs of exactly the same length and a longer one, I spoke to John at SeeMeCNC yesterday about it, apparently with some RAMBO boards the cables are too short, they've ordered later RAMBO boards with longer cables.
I just patched an extension onto the short wires.

Barnett (my brother in-law) and I had to add extensions to many of the wires. Not a big deal....just twist together, bend and tape off with electrical tape. This was for wood kit #6.....we had to improvise a few things.....part of the magic of DIY projects in the early stage. Have fun....don't fret too much. Good luck....