I have contacted Bob's. He was unable to help. Also had no resources to check out. The website for the 333 looked very promising. the gun itself is different in the selector design. https://www.gunpartscorp.com/gun-manufacturer/savstevspgfld/shotguns-sav/333-2
Thank you,
I will keep at it.
I will try to figure out how to post a picture of the spring.