2holer, you should also look at the site www.marocchiarms.com and see if there is a customer service number or email where you could inquire about the part you need. Marocchi makes the Tikka 512, the current iteration of the Valmet 412.

Somebody else on Graybeard Outdoors suggests you try a Valmet 333 20 guage ejector if you can't find a 412. Worth a look, but I find 333 parts are just as hard to find as any Valmet part, and the 20s are harder to find than the 12s. Good luck with Marocchi.