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I’ve been fielding a few questions about the actual dimensions.  I’ll try and get a good graphic from my OEM, but for now: I use a 7 3/8″ hole.  It could be a little smaller, but this gives you some room for error.  The OD is 8.25″ and the fastener centers are 7 7/8″ across.  For those of you flush mounting, the basket/gasket edge is 5/16″ (don’t forget room for your gasket!).  BTW, my BIB’s have bolts just a little under 8 3/8″ across.  I put a little dent in the outside of the basket for each bolt, and secure my BetsyK’s from outside the frame under the edge of button head cap screws.  I works really slick, because I can swap drivers (well, those I’ve dented) by removing only two screws and loosening the bottom two.  pj 

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