This comer gearbox part number 205805 / 9.205.805 fits many of the 9ft toppers, these are listed below (please call to confirm)
Slewtic 9ft topper Centre gearbox
Major 9ft topper (900)
Fleming 9ft topper and ZGPP56 LF135.005.20 and Replacement gearbox for Fleming TOP7SF, TOP8SF, TOP8T and TOP9
9.205.829 / 205829 and LF135.002.90 / ZGPP02 is also available please call or email for prices on this gearbox fits Fleming TOP6 and TOP6SM and many other 6ft toppers.