For anyone intrested, I got this e-mail from Timesert the other day.
KK55

From: catalog@timesert.com
Date: 2/26/2007 8:48:08 AM
To: KrazyK55
Subject: RE: Contact_Form


Hello,
Cadillac NorthStar Headbolt 4.0/4.6 repair kit part number J-42385-500
$396.37
This kit includes all the tools and 10 inserts of a M11x1.5x30mm additional
inserts are part number J-42385-507 $3.25 each.

Here is a link to the repair. You can also download
a short video of the actual installation process.
http://www.timesert.com/html/gm.html

Orders can be placed at:
(800) 423-4070 (775) 829-1026
We accept Visa or MasterCard and ship U.P.S
Best Regards,
TIME-SERT