complete newb question … was trying out a different rune profile on my motor last night, and noticed that the seals -- the exterior rubber whether stripping that frames the window-- around the door windows are all shot (I had rolled my truck two years ago, the doors are all donors). since I've replaced everything else on the dammed thing, may as well replace those. Never done it before, prefer not to use the trial-and-error method. what's involved in doing this? where can I buy new seals?