Rossi m70 22lr Revolver Firing Pin?

[Sonick]

I bought my dad a Rossi 22lr Revolver (model m70) to go along with his Rossi 38 spl (they are twins) but when I got it I realized it needs a new firing pin and spring. Does anyone know where I can get one? I've looked all over. e-gunparts.com doesn't even have this gun listed on their site. Thanks for any help.