I had one of these I'd similarly rescued from a secondhand furniture store about 25 years ago. I paid about $20 for it. Most of these parts can be found on eBay auctions, but the prices can be ridiculous. If you have no particular interest in this as a project, I'm sure you can find someone who is interested in working with it. You don't need to try to find a Rickenbacker bridge. The original was simple: two pieces of wood, with two thumbwheels. Check for photos of old Bobcats online, such as at the website operated by a french guy whose name escapes me (Harmony.demont or something similar). I'm thinking that you should be able to make one yourself, if you can't find something in a music store that works. Vintage tuners can be found as well, but if the spacing is the same as a Squire strat, that might be the way to go. The originals were six on a plate with white plastic buttons, as I recall. I replaced the pots along the way, so that I replaced the knobs with something that were not exact replacements ( I think I took them from an old radio), but didn't look bad or out of place. Of course, I had to enlarge the holes in the pick guard slightly to fit the new pots. While you have the soldering iron out, you might think about replacing the output jack. I see in the photo that the truss rod cover is missing, so (again) you can either bid for one on an online auction or simply make your own. The (original) one on mine was white plastic, shaped to a point, held by three small screws and had MADE IN U.S.A. silkscreened on it in tiny letters. You see this on many old Harmonys. Despite all of these modifications I'd made on mine, I disclosed them all to a buyer and was still able to sell it for a silly amount of money. He was primarily interested in the sound of the pickup, and he plays gigs with it. He's raised tha action a little and uses it for slide. So it found a good home.