In all honestly, I'd rather get a set of good springs that give an even drop so I'm less likely to mess up. About the product number....thats what had me puzzled. When I was first having problems, I checked the part number on the box and it matched up with my car's springs on the site...was first thing I checked. Maybe H&R boxed em wrong or something but Kauffman said they were the wrong springs for my car and they usually know what they're talking about.