Some guys are crazy about rubber floor mats, but the problem is, if any water gets under them, the floorpan is a goner. Our factory rubber-matted '70 Duster has about as beautiful a floorpan as you'll find in a 35-year-old car, except for the driver-side front that was ravaged by rust. this car had been a four-speed car converted to a Keisler five-speed. This combination leads to an unnecessarily wide tunnel when the original four-speed hump is incorporated. The Tremec features a centrally mounted common-rail shifter, which eliminates the need for the side-offset stock hump. Our plan was to repair the bad floor section and remove the transmission hump, so that we could later modify the tunnel to just the right shape for our Keisler transmission.