I got seat extenders for the drivers seat. How do they get installed. I understand that I use the suppied bolts to bolt the extenders into the holes in the floor. How does the seat get mounted to the seat extenders. There are hole in the extenders, but there are no holes in the floor. Just cannot figure out how to secure the seat, unless you somehow use bolts, but then they will not fit under the extension. Or I am not understanding this as it is so simple. Any info would be great. Thanks, Jerod