I can confirm these part numbers, as all have been purchased over the last 6 months.

Extractor Rev M1 315430000
Extractor Spring Rev C1 315610000
Extractor Plunger MIM 406130000
Firing Pin Rev A 408170000
Firing Pin Spring Rev A 404770000
Recoil Spring Rev A 407790000
Ejector 404570000

I can't really tell for sure what the cost is for these. The way S&W does the invoice the price is not shown. You have to look at the credit card charges and they don't match the invoices half the time. They add a hold then it disappears and shows back up later. I still have items ordered for several months that haven't made it yet.