http://www.greenlee.com/products/PUNCH-UNIT-ASSY%40c-D-(%40.625-X-%40.594).html
Above is the punch for that hole, I think, measure your hole and see if the dimensions are correct. If so then you will be looking for a switch with a D, DD, or doubleD nomenclature for the shaft. Just some information to help is specifying your switch mount.
lg
no neat sig line
The price for specialized Greenlee punches is staggering. The KO punches are a bit more competitive.
