I had the same thing, less than 15k also, I think the age becomes the problem and not anything else as I had to replace all mine, same with the Aldan shocks. I think I called Pete & Jakes and ordered their microflex bushings instead of using the Heidts, I just used the ones for a 4 bar setup with a 5/8" bolt (If I remember correctly). About time to just order a stick of urethane and turn my own I figure.