We have a 14 year old Kohler cast iron enamel kitchen sink that shows some wear on the bottom (hey - it is 14 years old after all).  We thought we would try putting a rack in the sink versus replacing the entire sink.  I contacted Kohler and they told me this rack would fit our sink.  I was so happy to find it on Wayfair at a great price!  The rack is very well made and is a perfect fit for the sink - problem solved!