Product review (2 stars): Defective Belt tensioner
All the parts have worked well so far EXCEPT the belt tensioner. I replaced all these parts in My Whirlpool dryer. After reassembly I got a very loud grinding noise when the unit was running. I had to disassemble and reassemble the dryer 4 times. I checked the entire installation and all was correct. Each time I disassembled  the dryer I would put one of the old parts back in. Lo and behold when I put the old Belt tensioner back in the dryer ran quietly and  perfectly. The odd thing is I checked the new Tensioner ..It was Identical and, when turned by hand, the Nylon bearing turned smoothly and quietly. However,under load it produced a very loud grinding noise. A brand new out of the sealed package DEFECTIVE part.  I was not happy at all. If you have a similar experience I hope this information will save the time and aggravation I had to deal with. If it has a loud grinding noise check the belt tensioner 1st.
Good Luck