IS the 39-539 hinge pair slider sold separately?

A home owner from Florida says:
Hi... Gosh you are amazing to have these old parts. We are retiring and bought a 1960's little house in Sebastian FL with a sun room with these old Anderson awning windows. Most don't work. We'd like to order some of these arm pairs 39-539. But we also could use bunch of just the black part... How much for just the black parts pairs?

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Tom from SWISCO responded:
Thank you for your patience in this matter. Unfortunately, we have not been able to find the black part for our 39-539 available by itself. You would have to replace the whole arm. I am sorry we cannot be of more help.
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