Looking for a part on my aluminum window

Also unsure how to remove it on an aluminum window frame, any advise



The part you are searching for is the 15-177 Coil Balance Shoe. There are a few different pivot bars compatible with this shoe, so I'll need to see a photo of the one you have to determine the exact replacement you need.

If you are also looking to replace the coil balance springs, you'll need the Series 152 Coil Balances. To determine the exact coils are needed to complete your assembly, you'll need to look for stamps/markings on the coil. If there aren't, any you'll need to obtain the exact weight of the sash and divide that by the total number of coils in the window.
The covers can be replaced with the 15-143 Coil Bushing, 15-144 Coil Bushing Cap, and the 15-145 Coil Barrel Support.