Product review (5 stars): Do it yourself!  It's easy, and will quiet your noisy dryer down.
I had a squealing Whirlpool Dryer, and thought I'd give it some maintenance and save a trip from the repairman.  This package came with everything I needed, and it runs very quiet now (like when it was brand new).

Note: At the time of this review, the product picture shows four orange rollers.  This is incorrect.  If this is the part number you need (double check), then you only need two of the rollers, and they are white.  That's what was delivered. So ignore the picture if it shows four orange rollers, and double check the part numbers.