Yes. The M9a1 will work as will the Vertec holster. I use a Safariland ALS for the Vertec, it fits my M9a1 and my LTT.
Edited to add: The forward portion of the M9a1 and Vertec are the same, the only difference is in the grip. Any should work. The LTT frame is basically an M9a1 frame.