Do you have a 710?

Are you missing a 710?

Yesterday I was having some work done at the car dealer.
A blonde woman came in and asked for a seven-hundred-ten.
They all looked at each other, and the Mechanic asked,
"What is a seven-hundred-ten?"

She replied, "You know, the little piece in the middle of the engine. I lost it and need a new one. It had always been there."

The mechanic gave the woman a piece of paper and a pen and asked her to draw what the piece looked like.

She drew a circle and in the middle of it wrote 710.
He then took her over to another car which had the hood up
and asked, "Is there a 710 on this car?"
She pointed and said, "Of course, it's right there."

Click here to learn the identity of the mysterious 710:
http://www.mademelaugh.com/gfx/710.jpg