Try Savage's part finder: https://store.savagearms.com/partfinder/
Enter your serial number and it should pull all the parts for your rifle. They also list the part number. That way, if you don't want to order it from Savage, you can cross-reference that with Midway. I just got off the phone with Savage yesterday about ordering a bolt body. It does list firing pins (and bolt bodies) as restricted to gunsmiths only, but if you call them, they can email you a Restricted Parts Waiver. That being said, in talking with them yesterday, they will only ship bolt heads to gunsmiths due to liability reasons surrounding setting proper headspace, which makes sense.
Good luck!