Yes, and I would personally not use it anymore and run full length new wires (not spliced) as that red wire for the high blower relay tended to get hot and melt the connector.
I forgot to add for the OP like I do in other A/C related threads, put a 30 amp fuse on that red power wire since GM bean counters didn't think it was needed. I too second moving the fusible links off the starter.
Likely eBay or salvage yard (or put a WTB in the forums here, hopefully someone might have what you need) but if the damage is extensive you may want to re-think what I believe some else may have already mentioned and consider just going with an aftermarket system (ie; Vintage Air) simply because you'll be getting an entire kit, with support for install, and you may find that by the time you muster all the OEM parts together since you didn't have existing factory A/C it might cost less in the end.
taking ebay outta the equation is a tough one as they haven't made these cars in 45+ years,they're kinda dried up at the junk yards and the days of a swap meet providing a decent amount of parts for our rides are gone as well. we don't have a lot of sources and it's harder be picky.btw the heat only glove box is different than the a/c version so add that to your list if you're looking to have a functioning glove box assembly in your car..
Going from heat to A/C isn't that bad when it comes to the glove box. It's when going the other way it needs changed as the heater uses a smaller box due to the space it takes up under the dash.
So new 10 gauge red wires with inline 30 amp fuse. Connect that to a junction block by the battery and run that down to the starter?
On our cars it'll be a 12 GA wire so either one can work & yes with the 30 amp fuse. Either location will work but I'd use the juction block for ease of access.
