AEW said:If the pad is removed, do the threaded holes in the frame extension line up with the bracket holes on the sill?
CJD said:There are pads. That's why I say I can't see what we're looking at. It could be the rubber pads are just slid so their holes do not line up with the holes in the mounting tab. With the floors removed, the body will have some ability to twist, so that can also account for a mis-alignment.
It does all need to line up so you are satisfied before the floor pans are even tacked into place.
John