My suggestion
First, call or e-mail Catalina factory. Catalinayachts.com. You should be able to get any part you need from them. They'll probably send you a new owner packet with a parts price sheet. (well they did for my 77 C27, anyway.) Just because you bought an older used boat doesn't mean you can't get factory support. Catalina is very good about supporting all their boat owners, new or used. It's not like buying a car. Then I would find the International Catalina Association website linked somewhere on this webpage and start exploring, I'm sure you'll find many C22 enthusiasts willing to help you. Good Luck.