Amherican Shower and Bath Corner Shower Door Panel Glide - U shape

A home owner from Amherst MA says:
I can't seem to locate the manufacturer any more. The vendor # on the parts was W1191 and the manufacturer's number was 420040 when we replaced these parts in 2004.
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Tom from SWISCO responded:

We don't have a guide that matches this, unfortunately, but the general design seems very similar to our 10-139. Ours is obviously a lot larger but it seems to work under the same principles. Do you think you could use this as a substitute? 

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10-139 : Shower Door Bottom Hook Guide, Pair
Shower Door Bottom Hook Guide, Pair
10-139
$11.17
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10-139 Shower Door Bottom Guide Instructions
10-139 Shower Door Bottom Guide Instructions
GUIDE
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