84-024 Looks to be Perfect except....

A home owner from Columbia, Connecticut says:
Your 84-024 looks to be perfect match for my sliding screen doors including the "70-1" stamped number. But, my sliding screen doors have the same spring-loaded assemblies on the bottom AND on the top. Does this make sense? My sliding screen doors (and the wood framed glass doors) were made by Eagle Windows about 30 years ago. I need to make repairs on all 10 of my sliding screen doors, so I may need total of 40 of your 84-024.
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Tom from SWISCO responded:

Thanks for posting! I've known some screen door installers to use the same roller on the top and bottom, sure. If it's what you have now, and if it's worked all this time, there's no reason to change it. I would just carefully go over your dimensions to confirm that they are, indeed, identical. 

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