The C2A input jack holes are 10mm, which is too small. You could drill them out if you wanted to use the Cardas jacks. In my opinion, the Cardas jacks are substantially more difficult to solder (the shell, not the center pin), and doing six of them would not make me excited. You'll also need a lot more of the dark wires stripped to really work well with those jacks, so optimally all of the CAT5 lengths would need to be adjusted as well.