Please identify my sliding window roller replacement

A contractor from California says:
July 17, 2011
Hello, we are looking for replacement wheels for slider windows, see photo. The wheels at top are the ones we need. The wheel at bottom is a PLPCI unit that comes close, but not exact. Any info appreciated. Thank you, Wencil S.
User submitted photos of their sliding window roller.
Profile picture of Paul
Paul from SWISCO responded:
July 18, 2011
I believe I may have a replacement roller that will work for you but it is not in our catalog yet. I will contact you again when it is ready to be viewed online and purchased (this may take a couple days).
Profile picture of Donna
Donna from SWISCO responded:
August 5, 2011
Hi Wencil,
The product you requested is now available. Please take a look at new SWISCO product code 87-188, Sliding Window Roller.
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