Your vacuum () uses a B57MXL belt which is a 110 mm rubber strip to transmit the rotation of the motor. The B57MXL belt is cheap and ships the same day.
Same day shipping
Return and free exchange within 15 days
Spare part : synchronous belt (toothed belt)
Elastic belt : no
Length : 110 mm
Section : MXL
Fits in : vacuum /
Reference : 50297088002,
Weight : 1 g
Here are examples for partial reference for home appliances :
Where to find the reference?