Need to replace Block & Tackle Channel Balances
Thanks for posting. Based on the wings of the nylon attachments, either our Series 380 or Series 385 channel balances will fit your needs. The only difference between these two Series is the 'depth' of the bottom nylon shoe. For the Series 380 this shoe has a depth of 1". For the Series 385 the depth is slightly bigger at 1-3/32". Compare with your old parts and see what makes most sense for you.
Based on the stamp codes provided, it sounds like you need our S380-25 or S385-25 with the 2430 option, as well as our S380-29 or S385-29 with the 2830 option. Make sure the dimensions and sash weights fit your needs before going ahead to purchase on our shop page.