I was also like,
and
and
I did notice, though, that with the disc installed, the tufts around the perimeter of the wheel well in the nine o'clock to two o'clock positions, were more stable. So JMac, I think you may be on to something.
OTM, I like your idea of doing both sides at once. Wish I woulda thought of it, but it took a fair amount of arm twisting to get the wife to drive with me as it was.