Tikka Threaded Insert Specification Needed

[Dogman-1]

I have a T3X Light that has a damaged threaded insert that needs replacement. It is the one that is used for the screw that holds the pistol grip. So far, I have been totally unable to find the specifications so I can buy a replacement – not even a TIKKA authorized repair center. It's not shown on the parts list. I've sent Beretta CS an email and no response other than acknowledging the receipt of the email.

Anyone out there know the specs?