Be sure to order the C6 as the M8 will not work on the 6x16." ???
In my experience, the M8 will work with a 616 fine, just use the first 6 pairs from the Amphenol connector. Both the C6 and M8 will need one station port on the KSU. In my region, there are more M8 units available in aftermarket channels than the c6, so I only keep M8 units on hand for shop stock.