Jorge S Stuart , FL September 18, 2016 Replacement for discolored knobs Appliance Pros had replacement knobs for my 23-year old Whirlpool range at a lower price than Whirlpool or other internet suppliers. The knobs were genuine Whirlpool parts, were easy to find on the website, and were delivered overnight. Read More... 3 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes