If you can't find a replacement sink of the same size, you could: 1) get one a little bigger and use a jigsaw to cut a bigger hole in your existing countertop; 2) get one a little smaller (or different shape, like round) and then add another layer of 1/2" plywood or particle board right over the top of the old one. Cut the new sink hole in this, put on new formica (or tile, granite, whatever); 3) Build a new countertop and or cabinet to accomodate whichever sink you like.
Have fun!
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