Aluminum channel for 87-213 ??

A quick learner from San Francisco says:
I have ordered and installed these rollers a few times as replacements and they're perfect. Now I need the aluminum channel that they fit into. Or perhaps a suggestion for another roller that will fit into a more readily available stock channel. Channel with inside dimension of 9/16" is proving impossible to source. Any ideas?
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Paul from SWISCO responded:
Thanks for contacting us. Unfortunately, the hardware you're looking for is unique to the particular company that made your window. There isn't any generic type we could offer to you. If you have the metallic AAMA sticker, send a photo of it and I will try to find the manufacturer for you. You would need to contact them directly.
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