Genuine Hoover Windtunnel Self-Propelled Belt Set (38528-034 & 38528-035) Hoover Wind-tunnel Self Propelled Upright Vacuum Cleaner . 38528-034 & 38528-035 Flat & V Belts Set Fits With Models U6634900, U6637900, U6637960, U8311900, U8315960, U8341900, U8341950, U8347900, U8351900, U8351950, U8361900, U8361950, U8371900, UH50000, UH50005B, UH60000, UH70010, UH70015, UH70040, U5194900, U5198900, U5780900, U5781900, U64019RM, U6420900, U6434900, U6436900, U6439900, U6445906, U6454900, U6471900, U6476900, U6476910, U6485900, U66009RM, U6607900, U6616900, U6617960, U6618900, U6630900, U6632900. Genuine Part # 38528-034 & 38528-035 Replace your belts every 3 to 6 months.