I would start my search at numrich gun parts corp.They can be found on the web.
One possible source is Numrich. Their website is gunpartscorp. The part is called a mainspring, part # 146680G. $4.75 plus shipping.
e-gunparts.com
Find a good gunsmith.
Try e-gunparts.com, gun shops, gun shows, want ads.
I do not think that they make larger clips for the Savage model 62.I know for certain that they do not make larger clips for the Savage model 64.
It a Savage model 30H
How do I get in touch with Savage Arms Co. and not this site? Bruce
Check Numrich Gun Parts Corp. website www.e-gunparts.com
your savage model 6 was made from 1938-1945 with a total production of 45,500.
Made by Savage/Stevens and is basically the same as the Savage Springfield Model 18.
you might try numrich gun parts.They have the most exstensive gun parts list that I know of.
walmart