I am not sure about the MK M2 connection. I see the list is from CEF, I asked the CEF rep why they could never give me a good price on MK gear and he said something about CEF and MK not getting along. CEF had to buy MK products from other wholesalers, which meant they could not beat anybodies prices, except maybe Homebase

I don't know if it was a load of bull or even if it is still the case?
My advise would be to steer clear of CEF unless you want to pay a premium (not just on MK gear but most things).