Not sure if I'm simply missing something in front of my face or not. How do you get a tool inside the cavity of the rear crossmember to hold the nuts on the bumperette and mud flap bolts? Is a stubby wrench needed? In through the side seems obvious, but cannot fit a tool in between the body, even if all the mud was cleaned out. The inside opening is quite small to angle in a wrench, then try to fit it to the nut.