Finding saddle for horse with high withers/large shoulders

I have a horse with high withers and large shoulders...I just have a very old english leather weighs a tonne old hunting saddle. £40 off ebay!! fits buds amazingly!
 
my horse has a huge wither with a short fall ,banana shaped back and huge shoulders and i ride in a lemetex grand prix dressage .
 
I can't really suggest a make, although the best fit I had was a Lemetex too, but my saddler advised me to always use the middle and back girth straps to allow more freedom in the shoulders, so that is worth considering.
 
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