Channel Balances for ID
Thanks for posting. Based on the nylon attachments these look like our Series 395 Channel Balances. Can you confirm that the one stamped '29-6' is 30" long, not including the end attachments? If so, see our S395-30, with a stamp option of 2960. That stamp option is for a window sash weight range of 32 through 35 lbs.
For the other balance, can you confirm that the metal channel (but not including the end attachments) is 35"? If so, then see the S395-35. If there is no stamp number, then you will need to weigh your window sash. That precise weight can be matched with one of the weight ranges listed on the product page. Let us know what you think.