I need 20 balances. I believe I need the series 300 ones. Mine are 21 inches long, 3/8 inches wide, red tip. My windows are non tilt single hung aluminum windows from the mid 70s. Windows are in good shape but none of them will stay up. My question is I don't see two of the parts I found. Below the plastic shoe or boot at the bottom was a small metal piece hanging off the end. Not all balances had them on there and I'm not sure where they go. The other piece is the metal piece that was attached to the side of the window frame that the shoe or boot went into. Not sure if that piece has been replaced by something newer. Any help would be appreciated before I order.
Thanks
Dave
