Does package includeds 1 set per window?

A contractor from Roseville, CA says:
Product Code: 87-180 This sliding window roller assembly is used on Merzon brand windows. It features nylon housing with two 3/8" diameter brass concave wheels. Does package includeds 1 set per window?
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Donna from SWISCO responded:
This tandem style roller is designed for heavy dual glazed windows or the housing may be separated into two separate assemblies for lightweight windows. It is sold as shown in the product image.
A contractor from Roseville says:
Hello Donna, I believe in an indirect way, you are answering the question! Your company sells them as singles and I need to order 2 each per window. And you are doing this just in case a window is light weight, then we can save money by cutting them in half and using one half at each end. Correct?
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Paul Sr. from SWISCO responded:
If your window is heavy you will need to order (2) 87-180 rollers. If your window is lightweight, you can order (1) 87-180 and split the housing to create two rollers for your lightweight window.
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