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You need to measure the distance between the rear forks that hold on the rear wheel. The wheel on your link is 130 mm, the older hubs that I am familiar with had a width of 126 mm for 5-7 speeds and 130mm for 8-10, it is important to get the proper size, since your frame is aluminum it should not be bent or widened to fit a wider hub.
You might look at another bike shop that can cut and thread a spoke for you and get it while you are there.