A quick learner from San Antonio, Texas says:
May 2, 2016
I need 12 29" spiral balances. 3/8 diameter. With a clip attachment. I placed an order, which worked perfectly, the problem was the very end of the spiral was longer than my replacement part, so I was not able to fully close my window. I am returning the balances but still need 12 replacement balances.
Paul from SWISCO responded:
May 3, 2016
Sorry to hear you're having trouble. I am certain we can help. It looks like you need a special made balance. Specifically, our S900-29 with a 15-073 shoe. Can you just confirm the color tip you need, as well as the total quantity? Once I have that, I would be happy to send you a price quote and order form.