What size hardware are the bolts that hold the intake to the hull?  5/16 or ¼?  I can’t figure out what I did with the old ones to check.

http://www.cpperformance.com/c-664-intake-adapter-mount-parts.aspx

Ok, I’ve already had a few drinks so ether one will work?  The glass is only about 3/8 inch thick around the intake and I was a bit concerned if I use the larger bolts and counter sink the heads it would dam near be through the glass.