Kirby Upright Vacuum All Generation Series Knurled Belt { 5 Belts } Part # 301291S Kirby Upright Vacuum Cleaner All Generation Series Knurled Belts { 5 Belts } Fits With Models : Sentria, Diamond Edition,Ultimate G, Gsix- Generation 6, G5- Generetion 5, G4- Generetion 4, G3- Generetion 3, Legend II / Heritage II, Heritage, Tradition , Classic III , Classic Omega , Classic , Dual Sanitronic 80 , Dual Sanitronic 50. Genuine Part # 301291, 301291S Replace your belts every 3 to 6 months.