They attached to the horn of the rider's stock saddle, and were spread across both the horse's chest and the rider's legs.
From the en.wikipedia.org
For example, we have McClellan saddle and Australian stock saddle as examples, as well as the more common western saddle.
From the en.wikipedia.org
Using less leather and fewer metallic and wood components they fashioned a saddle that was similar in design to the regular stock saddle generally in use in the West at that time.
From the en.wikipedia.org
Captured Brumbies can be trained as stock horses and other saddle horses.
From the en.wikipedia.org
Save saddle for another application, save giblets for stock.
From the denverpost.com
Stock classes are also available for quarter and paint horse breeds, including halter, walk trot, English and western pleasure, hunter under saddle and more.