Sweetness, can I ask how long you've been running these on your car for? I don't want to mess with anything that deals with fuel delivery as far as sealing things off properly is concerned. Logical thinking would dictate that the dealership is just trying to rape us all by charging us upwards of $7 for an O-ring and that there's nothing special about their OEM ones compared to the ones on mcmaster.com, but the wussy side of me also says, hey man what if their IS something special about the oem ones? I'm just paranoid. Can you offer some more reassurance? Thanks, haha.