These are 52C's & D's. You would need to find bolts and triggers for those models. As said above, there are not many available. I was lucky as I had a bolt long before
the barreled actions became available. I found a trigger on gun broker for the C model. There are two triggers for these. The D trigger is a better trigger and harder to find.
Even when you do get all the parts for the build, it will not be worth what you have invested in the project. I am still looking for a trigger guard, screws and a few other
small parts. In my case, I don't have that much invested as the bolt cost me around $100 and the trigger, around $200. I will still have around $700-$800 invested in this
project and you can find some cut stock D models in that price range. C's are harder to find, but mine will have a mis-matched bolt and a stock with adjustable butt plate.
I have put mine in my other CMP C stock and it does shoot nice. Head space was minimum. I got lucky there. You might find a bolt that doesn't head space and will need
to set the barrel back or re-barrel entirely.