Yes, POTR is a good source for parts. RickySounds (
http://www.rickysounds.co.uk) in England is pretty good, too - they even have the hairpin trussrods for 4001s. And, yes, RIC does sell parts. In the "Boutique" section of their website. As for the bridge pickup cover? To the best of my knowledge, that "cover" has always been plastic. The metal one you're probably thinking of wasn't a cover; that was the actual "Horseshoe" pickup that the plastic cover is intended to imitate. RIC sells the plastic covers (and yes, the 4003 cover fits a 4001), and also sells a replica version of the pickup; but they're usually out of them, and... they aren't exactly cheap, either. I have one, along with a toaster neck pickup; they'll probably go in my '73 4001, one of these days... Good luck with your restoration!
