Your vacuum cleaner originally came with Hoover belt part number 38528027, however Hoover has now discontinued this part number, and replaced this belt with the new belt which is part number 38528040.
The new belt is a little bit smaller then your old one, but unfortunately this is the only belt that Hoover currently makes that will fit your model.
Here's a direct link to our website if you still need to purchase one:
I have also uploaded the parts diagram and instruction manual for you. The parts diagram gives you every single part number for all parts on your vacuum should ever need to know another part number. The owners manual will give you step by step instructions on how to change the belt, as well as other maintenance instructions.
Part Diagram for Hoover U5227-930:
Owners manual is actually for the commercial version of your vacuum, but this will be identical to your instruction manual which Hoover doesn't have available for free:
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