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 Hi Vance, 
The front viewport is 38 inches in diameter. The 
mating surface is two 90 degree surfaces. That would a flat base with an OD 
surface at 90 degrees. 
I can hardly wait to install it, but it will be one 
of the very last things as it is a great way to get things in and 
out! 
Best Regards, 
Jim 
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