I have two 220 volt receptacles (one L14-20 and one L6-20) that I want to mount next to one another in a standard two gang switch box. This would mean I also need a 2-gang, single receptacle box cover (two round holes next to one another, one in the center of each gang. I can find a 2-gang, single receptacle box cover, but only one with 1.4" holes, rather than 1.6" holes that I need for these two particular receptacles. I presume (but don't know) that the 1.6" hole size relates directly to the fact that the receptacles are designed for 20 amps and 220 volts (as opposed to 15 amps or 120 volts). I can find a single gang cover with the 1.6" holes but not a 2-gang cover with 1.6" holes. Why is that? I really don't want to buy two separate 1-gang boxes because I don't want to have to run wires between two separate boxes (let alone the extra expense). Do you know of anyone who sells the 2-gang, single receptacle box cover for 220v, 20 amp receptacles?