Thanks and I found the Corsair installation video on Youtube which helped. Silly me I did not realise you took the existing fan out - Now their screws fit!!!
:o
Sorry to enter this discussion so late ! but I am just trying to figure out where to fit my H50-1 (like the H50 but with more CPU kits) in the nine hundred twenty.
Seems pretty obvious (to a complete novice) to mount it on top of the back fan housing with their additional fan driving air out...