I have a replacement steering stem that is identical to the rvf one i bent apart from the stem being 10mm longer

when i put the lower bearings on and put it into the headstock the upper bearings are lifted out of teh bearing seat as the taper on the stem is 10mm higer than the old stem.
I am confused as i cant think of another honda that uses 52mm fork legs with this type of yolk.
I have thought about cbr600rr perhaps?
Or is it possible my frame has been crashed and work has been done to reduce the headstock ans steering stem length?
Anyone got any thoughts?
Cheers