Years ago I sold many off the shelf saddles and some of the most popular " Gaited Horse Saddles" had a 7" gullet, 22" long bars that had a slight flair in the front of the bars fro extra shoulder relief and had about a 94 degree angle in the bar, these were very similar to what many call Full-QH Bars.
These Saddles only fit about 40% of Gaited Horses, like a QH for example all Gaited Horse are built different and I have found there are 3 size trees needed for a Gaited Horse, as with any breed some have different wither heights, should sizes and widths in the wither area as well as the way the back is shaped.
Some regular trees like Semi-qh, reg. Qh and full QH will fit will fit Gaited Horse, I find most will not.
I have found some QH's with shoulders so large they needed the extra flair in front of the bars like a gaited style tree has.
But just like buying a size 10 shoe, all size 10's are not created equal, a little research is needed before buying any Saddle