I have a 2004 Specialized Big hit Comp. I just bought this Manitou Sherman Slider. It is a size Small. The headset size in Millimeters is 156.5mm from cup-to-cup . I checked the fit chart and my bike is the right size for a "Small" Sherman Fork. I took these pictures showing how the top crown does not fit entirely down on the fork. Is this ok?? There is a 2cm difference. The bikes head size was at the very top of the "Small" requirements, so it could have even fit into a "Large" fork. I just want to know if this is ok.?