This OEM gray Dishwasher Lower Dishrack Wheel Assembly is a plastic kit that allows the rack to slide in and out of the dishwasher easily. If it breaks or becomes damaged. sliding will feel difficult....
First off, this part does not look like a seal. It seems more like a trim piece. It is the only part along the bottom of the DW door so it is indeed a seal, and the DW was leaking after I replaced the seal around the tub and the door. First take off the inner panel of the door by removing the Torx screws on the edge and the hinges. Pay attention to which hole each screw came out because they are different lengths. Gently separate the inner panel being careful with the wires going to the detergent dispenser. The seal is held on by 5 small hex head screws on the bottom of the door panel. Remove the old one and install the new one. Put the door panel back together and on the hinges. Good luck.