Product review (4 stars): It works, instructions suck, not sure if you need it
I bought it because my Whirlpool Duet Sport started making loud screeching noise. Replacing the parts worked, no more noise. Took me about 3 hours total. So, I would recommend it.
However, I feel like if I just took the dryet apart, cleaned out the fluff that accumulated there and just sprayed some WD40 on the rollers, then it might have fixed things too. None of the parts I replaced were worn out much. So, if you can't wait for the delivery or just want to save 20 bucks, I would suggest you try to just taking the thing apart and cleaning/lubricating everything.

Another thing that I want to mention is that instructions that came with the part are completely useless. They did not match my dryer, but even if they did - you can't make heads or tails of them. Instead, go to youtube and search for "Whirlpool Duet Sport Dissasembly" - there are great videos that walk you step by step for taking it apart and then putting it back together.