Wheel will not stay on

The top rack in my dishwasher are on rollers and one of the wheel will not stay in place, By looking at the device that keep the wheel in place was broken and I have to order the side section because the device that hold the wheel in place is the side section, It took about 10 min to replace the part, so I have order two, and used one, and will keep the other just in case it will happen again, i will have one on hand, to keep my wife happy