Window Channel Balance

Hello. I'm looking for a 795 Window Channel Balance, option 26c, with 1" T-Lock Balance Shoe, closed cam. My pivot bar is 2.5" long and the screw holes are 5/8" apart, so I should need the 26-021 pivot bars, unless my current pivot bar is compatible (see picture). My windows have the upper attachment as shown in the attached pictures. Although this hook is shown on your modifying the 795 Balance page, I don't see it as an option nor do I see way to modify my window to mount the 795's included upper mount. How would I use the 795 balance in my application and what additional parts would I need to order? Thank you for your help.

I will need 2 balances, thank you.