Product review (5 stars): Saved at least $75 using this kit
Our dryer had been making a squealing sound while drying that was certainly awful!  It seemed like the bigger the load the louder the squealing too!

I took the initiative to dismantle the dryer to figure out the problem and I did come across it.  The belt was almost crystallized on the back side and the idler (not a pulley) was quite worn.  The rollers seemed OK although dry (no oil or grease on them).

I searched for the spares and found them on Amazon.  I placed the order on Sunday night, received them on Tuesday.  The kit is OEM so it fits perfectly. I added a tad of white grease to the rollers and assembled the dryer back up without any issues.  This Kit provides an idler that has a pulley instead of the concept that originally came with my dryer which was like a Teflon coated metal piece where the belt rode.  I found while researching this that Whirlpool had installed this other piece as a cost savings however it did not pay off in the end.

That same Tuesday I ran a load of laundry and peace and quietness reigned in our house once again during laundry time!

If you are half handy like I am, this is a 1.5 hr project including dis assembly.