My JBL L19 speakers gave started to rattle at mid volume. The foam ring or neoprene gasket (not sure which it is) is dried out and falling apart. If I lightly touch the edge of the speaker, the rattling stops. I am looking to repair them, but not sure what the part I need is. What is the part I need? See photo. Looks like it glues to the housing and is lightly attached to the speaker. Also how hard it is for a novice to replace?