I recently purchased an '81 T40 from ebay. To start, it's in incredible condition. The only issue it appears to have is some small components that seem to be cracked and worn probably from shear age. The first part is the plastic covers around the pickups that are cracked where they screw in. The second is the covers over the actual coils (it appears to be some kind of vinyl). Wondering if these are things that can be bought and replaced, if there are generic replacements for them, or if I am SOL. Pointers please!