How do you remove the upper rack lock caps for GE Dishwasher Model GSD220Z07WH?

I need help with this too. i have a Whirlpool Quiet Partner II model #DU943PWKB0 and purchased a replacement for the wheel contraption which hooks onto the rack, with the wheel itself running inside the metal arms which allow the rack to move in and out. It would seem that I would have to take the white endcap off the metal arm to fit the wheel into the inside of the arm before I clip the part onto the rack. For the life of me, I can't figure out how to release that endcap.

:)
Hey whugo20! I did it! I got the end caps off my Whirlpool. Maybe this will help you. When catholic suggested moving the endcap to the side, it got me thinking of all the possibilities. My endcaps can't move to the side because of the way they are installed into the metal arm. Feeling all the parts of the endcaps, I found a place where it seemed like I could squeeze it. The queezable part was in a place that was hard to get to, so I got a very short and tiny screw driver and place it so that the arm of the screwdriver lay inside the metal arm to which the endcap is attached. I pressed hard on the screw driver and the endcap released and I was able to lift it out of its housing. Ta Da! Then I put the new roller into the metal arm and moved it down so it was opposite the roller on the left side of the rack. Then I had to turn the clip part so the fasteners could get inside the rack and clip onto the inside. I hope this helps with your GE.