i'm sorry if this may have been discussed before... but for almost every site(including rockauto) has the LFR6AIX {#LFR6AIX11} Iridium IX; 0.43 Gap .030
a quick search for the ngk LFR7AIX shows it available on amazon. which do I go with?I just wanted to make sure that there are the same? maybe the part number has been updated?