Seat mounts and harness

Section 6:2 in the general rules second sentence." The drivers seat must be supported on the bottom and back by the frame or crossmember. Except as noted in sfi specs, seats must be bolted with four bolts on bottom and one in the rear into crossbar; all bolts must go into frame or cross braces. "

Now in a pickup there is one small crossmember maybe an inch and half wide below the floor closer to the door than I like. Now since I am the one asking the question that in no way was asking about expired belts, how can I legally mount my seat in the pick up?

As far as my seat belt question the book says. All harness sections must be mounted to the frame, crossmember, or reinforced mounting,....

In no way does the rules say I cannot mount the shoulder belts to the floor where the lap belts are mounted. What qualifies as reinforced mounting? Is fender washers considered reinforced?

Copied my own post from moparts. Not getting much help over there just bickering about out of date belts. Hoping for some more useful info over here