newby here, but oldie to naked wings.
the person asking about brake rebuild parts, I have bought parts from JC Whitney, in Chicago. They have a very decent common wear part rebuild kits for various things like brake calipers and brake master cylinders, stators and rectifiers and so on... for wings. They ship worldwide and their prices are very reasonable for parts.
My rebuilds have lasted about 5 years and going with their parts.
I can not put in links but JCwhitney dot com.
for general salvaged parts I use ebay a store called pinwall
naked ones, past 76, 80, 83,
present naked ones (2) 84s, and 97 valkyrie (has original battery)
past with tux, 84, 90, 93SE