Hi Rick,
A 1950 Russian SKS45 has a spring loaded firing pin and different bolt design, so the later year Russian and all Chinese/Romy/Yugo/Albanian pins & hardware would not fit it. Your best bet is to look on the WTS board here, on gunboards, and to browse auction sites like gunbroker & eBay to find what you are looking for. They are out there, but they are hard to find because they are often listed incorrectly or listed without enough photos and info to determine what they truly are. 80% of what you find out there will be Chinese hardware.
Your best bet might honestly be to get a complete spare bolt with all the hardware included (FP, FP spring, extractor, extractor spring, & headless retaining pin). The bonus is that you would likely be able to drop in the bolt and get it to work. I would headspace the spare bolt to ensure you don’t have an unsafe fit, but it could be a drop in replacement if needed in a SHTF scenario.
Good luck and welcome to the boards!