On the balance only one letter 4

The assembly you have here is made up of the 15-087 Coil Housing Pivot and the 15-086 Tandem Coil Housing. Although, since both of them are stamped with a 4, you may only need to purchase the 15-087.

These housings are compatible with the Series 180 Coil Balance. If you chose to use only the housing pivot, you can use the S180-08; however, if you would like to stick with your original set up, you'll need the S180-04.

Detail of 15-087

Detail of 15-086