<Any chance I could fit 6.5's in the stock location (with some cutting of
the door panel) or is 5.25 all I'm going to get? >

Well, the 5.25 fit really well there, but you could cut easily and fit the
others in there.  I put my 6.5 right about at my elbow in the bigger stock
opening and kept the 5.25 where they were cuz they fit and the door cranks
can stay the same. If I could only do one set, I would put the 6.5s there
and cut a little. The space between the door and the dash is neglible so be
careful that the speaker grills will fit.

http://picasaweb.google.com/sandwichhead/SpeakerAndBatteryInstall?feat=directlink

Michael in San Antonio
91GL Weekender AT 2.1L 'Gringo'