vintage 1963 aluminum frame sliding windows

A quick learner from California says:
Looking for the concaved wheel and housing. Don't have photo, however looking at your site the housing looks a lot like the Capitol 87-115 , however mine has a flange on one end that has a snap in pin that fits in a hole on the upper right edge.

I need 8 of them.
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Bob from SWISCO responded:

The 87-115 is likely our closest match, but if the configuration is different enough I'm afraid it likely won't work for you. Sliding window hardware can be very tricky to replace, since dimensions on replacements have to be exact. If you want to be safe, send us a picture of the old roller and I'll see if we have anything closer. 

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