With a sway back it is almost impossible to find a saddle off the shelf.

Whether a curved tree or a flat tree is used will depend on the severity of the individual problem. The help of an expert saddler with appreciation of how to flock the saddle will be paramount. The panel needs to be full cut so that a banana shape can be made through the middle with less packing at the front and then the saddle balanced with the appropriate rear gusset.