[Ron Ramirez]

The plugs I posted images of are not polarized, that is true. The neutral and hot blades (what, I believe, you are referring to as N and L1) are the same size. The new plug is made just like the old 1930s plug, as you can see in the second of the two images above - the old 1930s Elmenco plug is on the left, the new Chinese-made plug is on the right.

Unfortunately if you seek a plug with polarized blades, this isn't the solution for you. But it is the first thing I thought of regarding a fused plug.