Replacement sliders

Thanks for posting. I believe this is either our S380-30 or S385-30 Channel Balance. The chief difference between these two balances is the depth of that bottom nylon shoe, or the 'heel-to-toe' measurement. See the diagram below for reference. Compare both with your old hardware to see what matches best. In either case, you'll need to choose a new stamp option, which designates the strength of the balance: go with 2930, which conforms with your old balance's stamp of 29-C.

Comparison of the S378, S380 and S385 balance shoes.

Thanks! That appears to be 1", so the S380-30 is my top recommendation. 

I see you ordered the S380-30 with a 2930 stamp option. The 2930 is a more modern version of your old stamp of 29-C-30, so that is correct.

Please feel free to reach out if you had any other questions.