The Marché Aux Pièces (in english: Piece Market) is a location that appears in Cars 2. Located in Paris, France, it is a large market that extends over several streets into an important metal construction, inspired by the Gare de Paris-Nord, that houses many part dealers, including Tomber.
We can see some mechanical parts sellers, like Celine Dephare who sells headlights, Justin Partson who sells shock absorber springs and bumpers, Alexis Wheelson who sells rims, tyres and hubcaps, and Jason Hubkap.
That's where Tomber, Finn McMissile's informant, is located.