added note: my Thorowgood is not that old, as might have implied. It's a fixed-width T4, high wither, which Dover was selling last year for about $450. I bought it used on craigslist for $300, in new condition, barely used.
It looks like the T6 doesn't come in high wither close contact, only a GP model is high withered. Also the T4 model, which costs less.
Thorowgoods have a lifetime guarantee on the tree, and with the gullet change kit the saddle may fit your next horse too!