I worked at a cabelas about 11 years ago and people would bring in their guns in all the time to check fit of holsters. You may be able to try taking yours to your local store to see if it will fit.
Thank you for contacting Beretta Customer Support.
Yes, the M9A3 will have the same frame dimensions as the Vertec. This would also work for the M9A1.
Best regards,
Beretta Customer Support"
I had this holster and it did fit my M9A3 so it should fit your Vertec. I returned it because I didn't care for it's belt attachment but it looks like you may be able to order different attachment options for it.