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S770-35 35" Series 770 Balance

I am looking for a counter balance for a MI window that tilts in. As you can see in one of the photos it has a marking of 35C tBSI. It is the 450/650/850 aluminum series

Both left and right are bad. Not sure what to do

Hello. Would you let me know if you carry this style of channel balance. I think I saw it on your website. Thank you. I know they can coe in different weights and lengths. If you carry the style, I need many.

The actual measure of the channel is 35 " 9/16" wide by 1/2"deep actual measurements. The stamp says Unique 34-C-30. I need at least 14 of these. I need 14 of these. The others are stamped 26-D-40. I need 10. The end clip is different than you off on this model please advise.

I believe these are series 770 channel balances and just wanted to confirm before I order. Thanks, I have 2 size one measures 35" long and the other is 29". The 35" ones are stamped 3500 and the 29" ones are stamped 2900. Both have a BSI stamp on them. I have several different size windows and have ... (cont.)

I've attached photos of a broken window pulley that needs to be replaced. The pulley broke in two pieces and was attached to a spring that is found on under an aluminum channel on the side of the window. The pulley appears to be gray nylon with a white nylon double roller inside. This is fro ... (cont.)

Balance 1: Markings - 2900 BSI KK 29 inches long Balance 2 Markings - 3500 BSI JF 35 inches long also including a photo of the brake for reference Thanks!

I need to replace four balances and they look exactly the same as the S770 series. The only thing that is writen on my original balances is 3500 bsi lg. I know i need 35" S770. I only need to figure out which one i need B,C or D. Can you please help? Thank you, Dino