assistance on ordering correct part

Hello,

Your balance is similar to the ribbed S751, except yours has the 15-043 terminal clip attached, which we can supply through a custom order. Note that these do not have a hole in the top needed to install with a screw like yours, so you would need to drill holes at the top. If you'd like to go that route, we'll need to know the exact weight of the sash your balances support, as well as the length of the metal channel. Please also confirm the number of balances you need, with the minimum being two. Thank you! 

Thanks! With that data in mind, we'll set you up with the 29" Series 751 with a 28R stamp. Two balances with this stamp can hold sashes weighing 15 through 22 pounds. As I described above, these will have the bottom "knife lock" shoe swapped out instead for the 15-043. 

I'll email you a purchase link and price quote now for 4. You can use that to place an order on our site. Please let us know if you had any additional questions and I'd be happy to assist!