Learned many years ago that Rock Auto is not the place to get quality parts. First time the new part from them failed I thought it was an anomaly. Gave it another try and the same thing happened. Never again. Fool me once kind of thing.
After that I figure it's worth the extra $$ to go for a more reputable part. It's not all about the money differential. Like many others, I'm busy with work, kids, and life. It really chaps my rear end to have to do the same job twice just so I could save 20 bucks. All the sweating and busted knuckles saved is worth it to me.
Same goes for Amazon with regard to parts. Been burned there multiple times. Buy from someone who's name is on the part and therefore has a reputation to uphold.