Tim,
Another data point. I had a Vizion 385 with the Tru Trak brackets. I recently put in the Garmin AP and the Garmin Servos bolted into the Tru Trak brackets with barely an issue. On the roll servo mount I had to create a little bigger radius around the output shaft area of the bracket to clear a raised boss on the Garmin servo output shaft. In conclusion I suspect that the Garmin servo brackets would work as well.
Bill