What are the seat brackets for?

I rigged a set to lift the rear of the front seats about an inch or so to gain clearance for my amps. I just bought some longer bolts (made sure they were Grade 8, of course) a couple of washers, and some large rubber stoppers (about an inch thick and 2-1/2 inches wide) with a hole drilled through the middle. It doesn't look bad and you hardly notice the seats have been lifted. I guess that's the poor man's solution.