V-10 Spark Plug Launch

I'm hoping some one out there might have a good idea.  I have a 2000 F-250 Super Duty with the V-10.  My number two plug sorta blew out yesterday.  It appears to have already been repaired with an insert.  I attempted to install a new insert, but alas, the threads have been stripped out to slightly larger than the insert that I bought at Car Quest.  Does any one make an insert that is slightly larger than the ones you normally get with a repair kit?  I truely hate the thoughts of haveing to replace the head.
 
Any advise would be greatly appreciated.
 
Thanks in advance
 
The wiz