Milgard Window rollers missing

A home owner from Las Vegas, Nevada USA says:
January 6, 2019
Somehow my new to me home is missing one out of each of my 8 windows. of course they happen to be on the bottom of the windows. I've looked online for replacements, but have been unable to find the correct ones. Can you help?
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Paul from SWISCO responded:
January 11, 2019

I believe we may be able to help. We carry a similar Milgard window roller similar to yours except it doesn't have the top locking pins. Take a look at our 87-021 sliding window roller. Carefully compare your measurements with ours and to see if this would work. 
Milgard Sliding Window Tandem Roller, 7/16" Flat
Milgard Sliding Window Tandem Roller, 7/16" Flat
87-201
$2.97
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