Block and Tackle rod Inquiry

This is a follow up to the first email I sent requesting help on identifying the correct part numbers to replace the balances in my windows. I have attached one more picture of the pivot bar used in my windows. The bar is 3-1/4 inches long and the holes are 1-1/4" center to center. I believe the S 795-28 channel balance will work in my windows. It looks like it comes with almost all of the parts assembled, but I will need a screw plug and 26-200 and screw 33-016 along with the pivot bars. If you can't identify which pivot bar I need from the picture I sent I am OK with ordering both the 26-021 & 26-366 to ensure I have the correct one to go with the S 795-28. I am wording on one window and want to replace the balances on both sides so my order needs to have enough parts for both. My sash is 19 pounds.