spiral balance part

Hello,

Your part shown in your photos look like a type of hybrid balance, which should have a stamp printed on the housing tube. If not, I would recommend checking the balance on the opposite side of the window as well. 

Hybrid balances like this would usually have a housing tube that measures 14-1/2" long rather than 14". I'd recommend double-checking your measurement to confirm. Thank you.  

Thanks for getting back to us. Could you also confirm if either of the balances from this window has a stamp code printed on the balance tube? 

Thank you for your patience as we worked on this for you. I believe that you could use the 5/8" diameter S600-14 blue tip spiral balance for tilt windows. It also looks like your original balances used the 26-139 single-hole aligner. Take a look and let us know if you have any other questions.