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It is confusing, I agree.

For Module Mounting Option it doesn't really matter since this mount replaces that part.
For Heatsink Mounting it will be whatever your E3Dv6 model is. Groovemount is the most common (https://e3d-online.com/v6-heatsink), whereas threaded is a newer iteration, still in Beta (https://e3d-online.com/v6-threaded-heatsink).

I hope that helps.