This comer gearbox part number 267806 also same as part number 9.267.806.10 9267806 fits many of the 9ft toppers, these are listed below (please call to confirm). this is the centre/splitter gearbox. 1:1 ratio
Slewtic 9ft topper Centre gearbox
Major 9ft topper (900)
Fleming 9ft topper TOP9, TOP9HDIN ZGPP57
Wylie toppers
Abbey toppers