I have a stock 2000 Xterra SE V6. It's my daily driver but I plan to do a bit of off roading this summer. Per some of the suggestions here I have shopped around both these sites. Which one is actually OEM? It seems the parts that Courtesy Parts lists are Hitachi and Rock Auto has a variety of parts from Standard to Airtex / Wells, Beck / Arnley etc... The prices range but Rock Auto certainly has the better prices. Regardless, I want my X to run as well as it can. Is Courtesy Parts the way to go? If so, I can shop around and make sure it's Hitachi or has the same parts number as what's listed on Courtesy right?