I ended up leaving the head on a 8x1.25x60 bolt, which left enough room to have a nut, the washer and the spacer on it. Then I threaded it into the lower sliders. I tightened the bolt down first (being careful not to overdo it), and then tightened the nut into place.
I will take it on a short test drive before I go all out, but I think it will work as a temporary fix. I will ask someone at the motorcycle place tomorrow if they think it will be OK.
whatever you end up doing is up to you,but be carefull,it IS holding your front wheel in place..!!!!
BTW your cb650 bobber is a huge inspiration for me, I hope I can make mine as cool as that