I purchased the Dorman plug boot adapter and find them average in quality. I was looking to buy a "SET" of 4 for my 4 cyl Alero and was worried the picture shows only 2 boots but the price made me think it was for 4. the description never says it's for 2 but it's my fault for assuming there would be a complete set. Not real sure why anyone would buy only 2 when it makes for since to buy all 4 when servicing your auto. My bad I guess. Look around, for the price of these 2 boots (around 13 bucks when I bought them) you should be able to buy a complete set.