Pivot shoe out of aluminum & different spring colors

Thanks for reaching out! To determine which spiral balances you have, you'll need to confirm the diameter of your metal tube. It should either be 3/8" (which would be the S900-25) or 5/8" (which would be the S600-25).

Since your tip color does not match, you'll need to obtain the exact weight of your window. Then you'll need to choose the appropriate tip color for your balances based on the weight range your sash weight falls between. Once you've determine the series, based on the diameter, you'll find the chart below the product description of the balance you need.

There are two different methods for removing the pivot shoes. There is the jamb spreader method or the cutout method. Take a look at the videos below for instructions.

Keep in mind, the cutout method may be the most feasible option.