Would this sink fix?

This sink apparently comes with a cut-out template - - you could compare that with your existing cut-out ? .. perhaps Kohler support can provide you a digital copy ? Then check the rest of the installation instructions for any possible snags and hope for the best. What are the counter-tops mad from ? .. in case you need to make any minor adjustments ? John T.

They are pretty much an "industry standard" size and shape. remove your existing sink and see if 16.5 inches will give enough coverage fore and aft over your hole. My bet is it will. 20.25 side to side should be plenty if yours is 20. top be sire call 1-800-4-KOHLER and ask for a copy of the template.