I want to get an extra AC cord for my 1985 standard model Questar. Its native cord has a two prong polarized plug at the (wall) end of the cord (blades of two different widths), and the socket at the bottom of the Q’s mount has two round prongs of different diameters so as to maintain the polarized orientation. However, it seems like most of the polarized cheaters out there plug into round prongs of the same diameter and maintain their polarized orientation by having a round rubber collar for one prong and a square one for the other on the cord itself. I mistakenly ordered one like this and it won’t work because the prongs (round rods) in my Questar’s power socket are different diameters, so one of them won’t fit the replacement cord. This is what I bought that won’t work.