OD of 2005 PS197TT Zero Flex Tower

[holdenh2o]

Boat is in storage and I've decided to "accessorize". :firejump:

What is the OD of the zero flex MINI tower/what size clamp do I need when ordering speakers and the like?

If a product does not come in that EXACT size, should I order larger and just use rubber inserts?

TIA

[skijwr]

I have a 02 X7 (same as prostar 197) with a full height tower. I think mine is the zero flex tower. I have 1 7/8 inch diameter tubes on tower.