I am no expert but recently moved a 15 out of a treadle cabinet and a 66-1 into it. The hinges on the 15 had two holes and the 66-1 had one hole hinges. I switched them out and the 66 fits fine except when I close it. Then I have to take the back plate off. If this isn't your situation with the hinges then I hope you find a workable solution.