Product review (5 stars): Exact Replacement for Kenmore Electric Dryer Model 417.84042500
After inspecting and replacing the motor because of noticeable shaft movement, likely due to worn bearings, it became evident the blower wheel also needed replacement. Rather than chancing a purchase for the wheel only (I'm a DIY'er and could have opened the Cover by drilling out the plastic pins), I found this complete assembly reasonably priced on Amazon with Prime. It was a perfect replacement and maybe even a little bit better in quality. Note as others have said, turn wheel nut clockwise using 7/8" socket to loosen while holding rear of motor shaft with pliers. I would also recommend purchasing a maintenance kit to replace wearable parts. Overall, saved me hundreds $$$'s  on purchasing a new dryer. There are great instruction video's online.