Erney Safe & Lock at 7th & Hulman, they have S&G locks and could possibly help with your lock. They are also American Security safe dealer. Rural King at 3235 Wabash Ave
Numrich Gun Parts Firearm Parts & Accessories | Military Surplus | Numrich Gun Parts #1501740B $24.95 This was the only one that had buy now, all the others were out of stock.