McGaughy's C notch 33003 on Crew cab question.
 

I'm going to install my McGaughy's C notch #33003 on my 2005 GMC Sierra crew cab. Looking at it I'm wondering how I'm going to get the front 2 bolts in. That part of the frame is boxed and it seems like any access would be blocked by the c notch once in place. Am I missing something? I haven't made my cut yet since I can't be sure I can access those bolts. Any help would be appreciated.