Coil Balances & Pivot Bar Needed

Thanks for posting. This looks like an older version of our 15-087 Pivot Shoe, and the 15-086 Tandem Housing. This system uses our Series 180 Coil Springs. To know what spring weights to select, look for stamp codes on the coil tape. If there are none, or are you uncertain, weigh your window sash. Give us that exact weight, and we'll work out what you need. 

Now, as far as the pivot bar goes, your pivot shoe has a different cam shape than our 15-087, so I'm not so sure what would work for you. Do you have your original pivot bar? If so, can we see it out of the window? That should tell us what would work for you. Thanks.