Need help identifying Tandem housing and coil springs

A home owner from East Orange NJ says:
Please help me locate this part.Pat5,353,548 stamped on side.Two of the tandem housings are marked 7 and end housing is marked 8.I need the coil springs also

User submitted a photo of a window balance.
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Paul from SWISCO responded:

Thanks for posting. Please see our 15-087 pivot shoe/bottom housing and 15-086 top housing. I would also recommend the S180-8 coil spring for the pivot shoe/bottom housing and the S180-7 for the top housing. 

If you're careful, you could take the old nylon housings apart without breaking them. That way you can just reuse what you have. 

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