I just measured inside my 146, and it is the same 14 1/8" +/- width noted for the 123. Thanks for the tip, I had no idea that the Engels and NRS Big Sky (may they rest in peace) were basically the same cooler, other than the better latches on the NRS. I will have to get me one of those baskets, along with a spare drain plug and latches that they still have at NRS (currently 20% off). I'm bummed I missed out on a replacement gasket while they still had them.
Show me your OOOOOO face