Most new vacuum belts will be drastically different in size (usually smaller and wider) than the used belts. This is due to the fact that belts stretch and wear as they are used. Most new belts usually require the belt to be pulled and stretched into place.  

Replacement Belts for Dyson DC04, DC07, DC14 Models without a Clutch (2pk)

If your Dyson DC04, DC07 or DC14 has the option to turn the roller brush off for hard surfaces and on for carpet then it has a clutch and see our other listing for that belt.