The Average English Saddles Translate to Western Saddles
30cm - 6.5"
32cm - 6.75"
34cm - 7"
But the most important is angle of the Bars.
I would check for sure with a template, but with your description, picture and specs from the charts for your breed, I would say you need a Semi-QH 6.75" Gullet, this would be a custom size. Ralide Trees which are extremely popular in the US have the specs on a Semi-QH as 6.5" Gullet.
A Full-QH Tree normally has too flat of an angle for this higher withered Horse.
I belive you mentioned your trainer said an Arabian Tree, on many occasions they work, but not always on that breed.
Most Companies offer a template, I would check with that especially because of the cost getting a Saddle shipped that far.
May all your Trails be happy and safe ones
Last edited by SouthernTrails; 12-19-2008 at 06:49 PM.