4spd hemp location

I did the same. You do not need a different cross member. The hump will naturally fit in the place where it belongs due to the existing shape. I placed the hump then traced it with a marker. I moved it out of the way and using a reciprocating saw I cut two separate holes in the existing hump for the linkages, (within the outline, leaving overlaps for welds). You will see you have to cut around the floor support frame. (that is why you will cut two holes)
You will also find one of the linkages runs over the floor support frame while the other two run under it.
Now, if you do not have a preshaped hump that could be a problem. Mine layed in place well and had little play for error.
Hopefully that helps.... I am not sure if the hemp will.

Greg