Two options:
1. Call Deer Creek Products at 765-525-6181. They have a stock of parts for the CVA products, including locks for the shotgun, and they are good people. I bought a CVA shotgun kit back in the 70's but didn't get around to building it until just last year. I had preserved the metal parts to prevent rust and stored them separately from the kit package, and the locks were missing when I dug them out. Deer Creek had the locks, cost me about $30 each as I recall. Naturally, one week after the new locks arrived I found the old ones. Which brings me to...
2. Send me a pm or post a note on the pistol forum and I'll part with my extra locks. I have no other use for them. Same price as Deer Creek.