I just gave you more help than you could ask for. Top of the line premium stuff.
Introduction into the real world can often be harsh, I may have just saved you thousands and what I did in parts all day long. The uninformed are money trees waiting to be shaken of the dollar bills, and parts guys get incentives based on how hard they shake you. I watched guys that intentionally mis-steered customers to max advantage for themselves, and tried to get every one fired as fast as I could. The chains will give you 30 seconds speaking of honesty then grind you down every day demanding you toss any ideas of it into the trash.
Always look over the shoulder of the parts store guy reading your codes to see them for yourself and WRITE them down. I used to insist on customers doing it when I read codes and some even got mad until later they came back thanking me for pushing them into doing it. Nobody ever remembers the exact code the next day.