I called Fleece and was told I need a fatter o-ring to stop my leaking radiator lines. Without taking this apart, I have no idea how much fatter to go. Any ideas or do I cripple my truck while I hunt for a couple of o-rings?
IMO pull the o-ring you have, go to the hardware store and get a few different sizes and see which one fits the best on the truck. It's kind of a pain but it works well.