The headliner in my 325 is shot. both the sunroof panel and the main roof look like crap, and the fabric is heavily oxidized and rips easily. Is there an easy way to replace this item, and spruce up the interior while I'm at it? I understand that I will need to pull the sunroof (need to do it anyways to replace a guide rail) and both the rear glass and windshield. This isnt too daunting to me, but where can I get a new spline for the gasket when finished?