1903 Receiver / bolt / receiver markings help.. days searching!

[browningautorifle]

where would one shop for such parts and be confident in getting legit items?

Here's a couple places you could look... https://www.libertytreecollectors.co...?idCategory=80

SPRINGFIELD 1903-A3

Products

Springfield Parts | 1903 Parts | 1903 Rifle Parts | SARCO, Inc