Silverline Tilt Block and Tackle balance 2740F

Thanks for posting. It appears the nylon attachments on both ends have 'wings', or side tabs. Please confirm, If so, see the S380-28 or S385-28. The only difference between these two channel balances is the 'depth' of the bottom nylon shoe. See below. Measure your old balance's shoe depth to see what matches best. For a stamp option choose 2740.

Comparison of the S378, S380 and S385 balance shoes.