Block & tackle balances for a Milgard window

Thanks for posting. I believe this is an S385-33 Channel Balance. The only alternative would be a Series 380; however, the depth of the bottom nylon shoe seems to be greater than 1", which would match the Series 385. That said, pictures of measuring tape can be deceiving, so please compare with the illustration below to be certain. For a stamp option, choose 3230. Let me know if you have further questions.

Comparison of the S378, S380 and S385 balance shoes.