MC connections?
No, not MC specific. I figure you can screw in the terminal post, then use that clamp on. If the post nut is the wrong thread, just change out the nut, I don't know if it would fit. I would email KnuKoncept before ordering.
eastern beaver makes a great fuse box / terminal connection
They do make a good one, and others brands too, with nice options.
I bought a used set of the positive/negative battery cables, and I used them as extensions for mounting all the extra items that have been added to the battery, with a nut/bolt/cover to hold them on. This way I only have 2 leads on each screw, when it comes time to remove them from the battery. Those leads already have built in fuses, and I did find my external additional fuse box, which I intended to add a relay too and move all my additions to.