Okay first I have a 2014 sportsman 550 touring eps. The battery that came with the quad is a usa 12.6ah, 210 cca. It measures 6 1/2" tall, 3 1/2" deep, and 5 1/4" wide left hand positive. I have called everywhere lol. The best I have found is at my local popo dealer is Yuasa Battery, Inc.YTX20H. While it only has 18ah it does have a high cca (310). My battery lays flat not upright. I can go to probably 7" wide and there is a spacer underneath that would allow some added depth. I would like to get a 30ah. If anyone has a SPECIFIC battery type and model that would fit I would appreciate the help.