As suggested, you can order direct from Savage.
You could also run an ad in the EE too. Cooey's don't have a safety built into the trigger groups, but will fit. Later lakefields n' Savages have a safety incorporated into the trigger group. Basically the same rifle in production for 50+ years.
I may have a trigger here, but it will be an older Cooey, and will take some digging/drawer-mining to find it.