Product review (1 stars): Whirlpool 4318165 Door Closer Kit did not fit the hinge, it was useless.
Although I was careful to indicate our refrigerator model when ordering this kit, it did not fit.  I was able to fix the poorly closing door by adding a metal washer to the hinge, which raised the door a bit and solved the problem.  If you order this kit, make sure it fits your hinge.