Need Pivot Lock Shoe replacement and window lock mechanism

This looks like an older version of our Series 140 Coil Balance System. Your stamps are a little ambiguous, so to know what spring weight to select, obtain the exact weight of the window sash. Divide that weight in half, and that will tell you the spring weight needed for both sides of the sash. Let me know if you have any questions. 

Correct, in that case, (2) of the S140-10 10 pound systems, one for each side of the sash, should work nicely (being within one pound of the overall sash weight is fine). See the video below that illustrates how to remove and replace coil balance systems.