Okay, contacted Rickenbacker. They say that if you send in your old truss rod cover (or half of it!), plus $45 bucks, then you can get a new one. Rick said that I could get a gold truss rod cover for 325C58 and the 660. However, they said the truss rod cover's holes may not line up with later 325 models, such as the "Miami".
They actually did say to send in at least half of the cover, if it broke. The problem is, someone could purposely break theirs in half, and then send each half in for a new cover.
