9.25-8.75 = .25no I mean .25. If the total thing is 9.25" in diameter, the edge to the port would be .25".
way to ruin the fun.25 each side LOL... wow.
but let me go measure mine real quick.
9.25-.375 = 8.59.25" outer diameter, 3/8" mounting lip.
now, can ya figure out the hole cut out //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif ??