Do I also need to order a stud?
Answer Hello Linda! Part number WD12X10074 is the rear roller for the lower dishrack. You will need the dirack roller stud WD12X10277 to install the roller. Thanks.
Does the roller snap onto the rack? What is the axle?
Answer Hello Bill! The roller WD12X10074 snaps onto the axle WD12X10278 which will clip onto the lower rack. Thanks!