mesa 1x12 wide body port dimensions

j4q0

New member
I just got a mesa C90 speaker and I'm building a 1x12 cabinet for it.
Does anybody have the dimensions of the port of the mesa wide body closed back cabinet?
 
I do have the plans for the TL806, however the size of the mesa wide body has different overall dimensions.
Should I assume the triangular port has the same area as the 2 side ports on the TL806?
 
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