Firing pin springs for a 1930's Savage 420 / 430 O/U shotgun

[Sudsy]

Seem to be impossible to get when doing a search under Savage 420.
Do we know if any other gun used the same springs ??

[big honkin jeep]

Have you got one for comparison. Sometimes a good hardware store ( not big box a real hardware store) or someplace like Grainger may have a suitable spring for firearm use.