People have probably noticed a number of eBay ads that says 'fits _______'. This includes things like 12 volt power radio antennas and the ashtray noted here. The seller claims that people have switched their old cars over to 12 volt from 6 so the electrical items will fit. Otherwise, they just figure it will work because the part is identified by installation instructions or the packaging as a "universal" item and to them it means fits everything.