About a year and half ago I purchased the Road Zeppelin seat cushion from Harley. (The cushion, not the seat.) The inflation valve and deflator started leaking this year. I called the dealership for some help in purchasing this @$5.00 part and I was told that I need to purchase the entire seat cushion ($130.00) since they do not sell any of it's parts. Any one know where I may purchase an aftermarket vent valve and get my seat cushioned again?