Read you loud and clear re. hex bolts -- try getting the AC compressor bracket
off after thirteen years.  Boston Bob recently cued me in to the ultimate
stipped bolt / nut tool: Channellock's "Nut Buster":
<http://www.channellock.com/acb/stores/2/product1.cfm?&SID=2&Product_ID=40>

The bottom jaw is curved up so that the harder you pull, the harder it digs
into the nut or bolt.  Be careful with the big black coolant pipe, it's a
$100 part.

Best,
d.
1990 GL -- "Mudskipper"