What drivers are in Monitor Audio Silver 9's?

It hasn't always been the case, even though they specified in house drive units.

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for example look exactly like OEM SEAS drivers. This is going back a bit though so maybe things have changed.
 
Silver 9's

I was hoping those were Seas drivers. I have a nearly new pair that sustained freight damage, so I thought of building some heavier and better braced cabinets for the drivers. It seemed like it might be fun to add a larger driver to that for a bit deeper bottom end. I was thinking 7" or 8".