2nd gen fabtech 6 inch basic help!?!?!?!

AHHH!!! sorry truck has been giving me alot of frustration, fabtech kit itself has been amazing, but just about everything thats stock that needs to come off has been breaking, im pretty much done but im worried about my hub/spindle assembly. if anyone has a picture of the complete assembly without being mounted on the truck that would be great, ive put the hub in the new spindle with the hub and seal but there seems to be some space around where the abs sensor is inside the spindle, is this supposed to be here or should it be filled with something? any help would be great and very much appreciated

 

both sides look the same so im not sure if theyre both missing something or if there supposed to be this way