What part is this?

Hey there,

Thanks for writing in! Your coil assembly appears to be the 15-087 Coil Housing Pivot, used along with the Series 180 Coil Balance. Since your housing is stamped with an 8, you'll need the S180-08. 

The compatible bracket is the 16-031 Mounting Bracket.

To confirm that this is assembly is the correct fit for your repairs, take a look over the dimensions below.

Detail of 15-087