I did a quick measurement of the "twins" and they are around 13" in the front. Didn't think of measuring the back :? Will have to do that. Don't have any parts store around the that carries them and I'm leary about ordering them online without seeing them first. Such a hassle to return things. Sure would be nice if J&P decides to open their store in Daytona. Was up there a couple of weeks ago and they are still stocking. :x