Aluminum window bottom guides

A contractor from Nevada says:
February 13, 2021

I need guides for Aluminum windows dual glazed possibly 30 years old maybe milgard not certain old bottom guides have rollers that roll on center raised track, top guides are

plastic inserts,this is an apartment complex window's I need guides for #4 windows top and bottom 

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Tom from SWISCO responded:
February 16, 2021

Looks like you need a new sliding window roller. It's tough to make yours out from these photos, but it reminds me of our 87-205. Look this part over and see if you think it would work as a replacement. 
Tandem Roller Assembly, 5/16"
Tandem Roller Assembly, 5/16"
87-205
$2.47
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