I found one for sale at a great price that the seller didnt know if it was from an A or B sized harness. My horse is 34", sometimes even 35" depending, and a stockier build. The breeching is 34" and I think im going to purchase it, and if it doesent fit, just resell it. For the price I cant go wrong, and I think if its too big I can add some adjustments. I dont have one that fits well to measure, since I currently dont use one.