Galazan, AKA Connecticut Shotgun Manufacturing Company, has them in their catalog. There are 4 different "Safety Springs for Double Shotguns" on page 100 of the undated catalog. Tele 860-225-6581. email:
galazan@msn.com
$40
Once you buy from them, you are in their mailing list forever. I try to buy something every year to maintain that listing.