If you haven’t already, you should check out these videos made in collaboration between The Dressage Connection and MacRider USA saddles. I am in no way a saddle fit expert — except, perhaps, in that I cleverly “chose” a horse with an easy to fit back!! — and these videos are informational, entertaining, and short enough to be easy to fit into your schedule! I also find the host super entertaining, and the topics to be very relevant. As they make more (because they will! I will die without them!), I’ll continue to share.
On the MacRider gullet system
On tree adjustability