Window guides for 380 sash balancer 34"

A contractor from Laguna Hills, Ca says:
These parts are aluminum, not sure of the weight of the windows but they are pretty heavy. Need four pieces asap
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Paul from SWISCO responded:

The width and height of the top sash guide are the critical dimensions. Start with our 18-012 or 18-013. The 18-012 is 5/8" wide and the depth is 19/32" while the 18-013 is 3/4" wide and 19/32" deep. See what you think. 

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