Hondo,
I was able to drill and tap for a helicoil insert into the captive nut but it sounds like your captive nut is completely gone ... bummer. Besides replacing the shock mounting plate, it is possible to cut a flap on the side of the shock mounting plate and slip a steel bar that has been drilled and tapped with the right spacing and threads for two mounting bolts. You will need to knock out the other captive nut that shares that side. Temporarily mount the shock body with 4 bolts which will hold the new strip in the right alignment and then tack weld the strip in place. The flap can then be closed and welded.
G'luck!
John
[ 12-15-2002: Message edited by: John Loftus ]</p>