Re: '65 reverb unit - restoration
You aren't going to find original or NOS parts very easily or for less than big $$$. I have a pretty clean '64 and the white knobs are available from Fender (they used them on a few recent amps) and the RCA cables can be made up using Lenzite (the 2 conductor wire you see on SD vintage style pu's and old Gibson stuuf), pretty easy to do. One cable is about a foot long, the other is about 8 inches. If you are a really dedicated parts fanatic, you can usually find Lenzite RCA cables in old tube radio/TV sets.
A tank is another story; you need a Hammond/Gibbs that works correctly in an upright position. A standard Fender combo amp tank won't work right. There are Accutronics out there, but they don't really cut it IMHO. The surf guys snag a lot of the old tanks when they come up for sale. The hanger springs aren't a big deal; most hardware stores carry an assortment of spring types that you can modify to work correctly. Check out the Surf Guitar 101 Forum and try a search there...they are stone crazy for the drip. Sorry---no camera handy, so I can't provide pixs, but let me know if you have any questions I might be able to answer...