Truth Saddlery - SADDLE FIT BASICS - GULLET WIDTH Tree Widths: Semi-Quarter horse bars usually have a 6 1/4" gullet, and Quarter Horse Bars usually have a 6 1/2" to 6 3/4"
Saddle-Interchangeable Gullet - Black John Whitaker Vienna Dressage
How to Measure a Saddle Gullet (English & Western Saddle) - Saddles Now