The bronze clutch throw out button should be tight to keep from turning. It should be made of oil impregnated bronze to keep from wearing. Both belt numbers referenced in thread are the same length. One is a 1/2" width and the other is 3/8". Either width will work. The one you already have is the 1/2" width and thus needs to be at least a 4L820 or 4L830 (82" and 83" respectively). From the looks of the pics I would get a 4L820 if your current belt is not jumping off the pulleys.
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