GT-40 dash vent and tubing

anyone know what the size of the dash vent and tubing diameter is for the GT-40 2.25 or 2.5? I want to order it one time
thanks
Don
 
The eye ball vents, the RCR kit now comes from vintage air with nothing for dash vents. I have been shoping for vents but they all go by tubing size no outside diameters of eyeballs listed
 

Dwight

RCR GT 40 Gulf Livery 347 Eight Stack injection
I don't know the brand of my unit but the dash louvers are 2 1/2". I'm searching for the eyeballs louvers. Mine were missing when I bought the car.

Dwight

Dash Vents
 
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