It was easy to replace the broken dishwasher rack's wheel with the replacement part.
I had previously replaced one wheel on the front right side of the upper rack, and within a year the front wheel on the left side also broke. [ I probably should have ordered 2 replacement parts at the same time, as it was only a matter of time... :-) ]
I also repositioned both front wheels on the upper rack, moving them a bit further towards the rear of the dishwasher rack I concluded that they had brokne because they were bearing too much weight by being located too far to the front.