7 Here's our new Danchuk inner rocker. You can see how the inner goes all the way back behind the quarter-panel. If your car's quarters are fine and you just need to replace the inner rocker, don't fret. You can do it without cutting on the quarter like we did. It'll just take some extra time and patience. On a Tri-Five, the inner rocker butts against the floorpan and doesn't slot into it like later-model cars.