Wow - the complete set of exploded diagrams with part numbers! I did not realize that this was available, and I feel a bit like a kid in a candy shop!
1. The check valve in question is pictured on the page labeled "Brake Master Cylinder," and it is referenced as #9 - the NonReturn Valve. Its part number is 0607AA0341N
2. Another broken part would be pictured in the "Air Intake System." It would be #15 listed as Fitting, Crankcase Hose #0309AAB00041N
3. While I am asking, I could also use a part pictured on the "Brake Tubes" page. It was missing when the car arrived, and it is #5 listed as Jounce Hose, Frame to Caliper #06061CAA00740N (I have ordered an Edelbrock hose and fitting, but it would be nice to match both sides.)
USMC, thank you for responding, and thank you for the chance to peruse the exploded diagrams!