Size of NON AC 2.5 V6 drive belt!

[Ford Prefect]

Does anyone know what size the non AC drive belt is? My car has snapped 2 AC belts inside a week, this is becuse of what looks like some emissions gear that keeps rubbing on the belt. I don;t have time to look into why, so want the non AC belt which will keep well away form this.

Stewart

[Marks DTM Calib]

Yes, its 1900mm.....which is the same as that used on a 2.0/2.2 4 pot with aircon.