here is the link of the belt you need for Simplicity model F3600
https://www.ezvacuum.com/simplicity-vacuum-belt-for-freedom-upright-vacuum-cleaner-p-3720.html
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here is the link of the belt you need for Simplicity model F3600
https://www.ezvacuum.com/simplicity-vacuum-belt-for-freedom-upright-vacuum-cleaner-p-3720.html