Searching for Level 2950
Hi there!
With this combination of attachments, you could have either an S380 or S385 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. You'll also need a spring strength option of 2950.
Your stamp is 2950 which translates to a sash weighing 28 to 32 lbs. If you want to be certain, you can remove your sash and weigh it to choose the appropriate stamp option. There's a chart on the S380 and S385's product page that shows you which option you'll need based on the weight of your sash.
If you have any further questions just let us know!
Your stamp of 2950 represents the weight range your sash can hold. If you need the S380 channel balance then you'll choose the spring strength option of 2950.