I find your photos of a repair on a GE dryer interesting, but this is not the same design as the Maytag (Whirlpool) dryers. The Bravos 300 series are very similar to the Maytag Neptune series.
To replace the two wheels (located inside the rear of the dryer) on which the dryer drum rides - these do wear out depending upon frequency of machine use and size/weight of the loads. The front of the Maytag machine must be removed, then slide the drum out, and use a ratchet with socket to remove the two wheels with their holding bolt. A kit containing all the necessary parts can generally be purchased through an appliance parts center for about $40-50. Be sure to have your model number when ordering/purchasing the parts.