Window channel balance 17"

Thanks for contacting SWISCO. Based on the characteristic nylon attachments and the length you have provided, this looks like either our S351-17 or S390-17 Channel Balances. The only difference between these two kinds of balances is the depth of the bottom nylon shoe. The Series 351 has a bottom nylon shoe with a depth of 1"; whereas the Series 390 has a bottom nylon shoe with a depth of 1-1/8". Compare with your old part and see what matches best.