I have been looking for a new saddle pad because a normal one isn't working out for my horse. She has higher withers and a normal pad pushes her withers against the saddle and I think that would be uncomfortable. I found cut out pads, and I also found cut out pads that are built up around the withers and middle of the pad to raise the saddle off the withers. I'll attach links to the two pads I am looking at, feel free to attach different saddle pads that could work. I don't want to purchase a new saddle.
Weaver Bronco Built Up Cut Back Western Saddle Pad and Western Saddle Pads with Fit Adjustments | EQUESTRIAN COLLECTIONS.COM
Neoprene Gel Othopedic Wither Pad - Statelinetack.com
Here is a picture to show that she has high withers, to give an idea of her body figure.