When you think about magnificent stocks, I'm sure the "Magnificent Seven" tech-focused and innovative enterprises come to mind. Their returns in the past decade have certainly been spectacular. But there are two lesser-known and definitely more boring companies that have also trounced the market. I'm talking about O'Reilly Automotive (ORLY 0.40%) and AutoZone (AZO 0.90%). The former is up 678% in the past 10 years, while the latter has risen 498% during that time. Should you buy these two skyrocketing retai ...