As in what is the difference between the two, or how to tell them apart visually?
General Saddle Facts - Fitting Your Horse to the Saddle
There seems to be much confusion on the fitting of horse and saddle. One article you read tells you that even the least amount of wrong fit will permanently ruin your horse''s spine. They recommend an elaborate computerized measuring system, to be used only by a technologically trained expert, in the field, to recognize all possible pressure points on the back of the horse. The Feed Store employee tells you that the saddles on their racks should fit any horse. Where is the answer?
semi- quarter horse bars - 6 1/2 gullet is by far the most common tree. it is for the medium back, decent wither and often mixed blood descent (1/2 arab, Appendix or other mixes)
full quarter horse bars- (7" gullet) is often used for blocky low withered quarter horses or horses with broad backs.
quarter bars - 6 3/4 gullet often works for the horses that are hard- to fit. they are between semi- quarter horse and full quarter horse bars saddles.
Over the past few years, in an effort to be more specialized, many production saddle makers are offering some saddles in the quarter horse bars'' angle on a 7" gullet width. This they call "full" quarter horse bars.
It is designed to fit wide backed horses, those who tend to have a problem with saddles slipping sideways due to flat withers conditions or large bone structure. The saddle widens over the center back of the horse then has angles that hold the topsides.
If, on the other hand, your horse has a high withers, you will not have problems with slipping sideways. Your problems will be rubbing on the top of the withers or poor fit on the sides of those high withers. Go to the semi-quarter horse bars.
semi- quarter horse bars - 6 1/2 gullet is by far the most common tree. it is for the medium back, decent wither and often mixed blood descent (1/2 arab, Appendix or other mixes)
full quarter horse bars- (7" gullet) is often used for blocky low withered quarter horses or horses with broad backs.
quarter bars - 6 3/4 gullet often works for the horses that are hard- to fit. they are between semi- quarter horse and full quarter horse bars saddles.
http://rbpaints_2000.homestead.com/saddlefit.html
