MI windows series 6250

A quick learner from Adrian says:
We have MI windows series 6250. We need two sets of the block and tackle for these windows ( the parts that prevent the window from falling down upon itself). MI Windows indicate that they no longer have these parts and suggested we contact you. Do you have these parts? If so, how many as we will purchase extra should other window parts fail.
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Tom from SWISCO responded:
Hey, Mitch. I wasn't able to identify specifically what balance you have, but we do carry a wide variety and one of them may work for you. Could you show me a picture of your balance out of the window to start out?
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