What component forms the housing for the rear wheels?

The component that forms the housing for the rear wheels is known as the quarter wheelhouses. These are the enclosed spaces that provide structure and protection around the rear wheels of a vehicle. They are designed to accommodate the wheel and tire assembly while also allowing for necessary clearance and movement during operation. Additionally, the quarter wheelhouses play a role in supporting the overall integrity of the vehicle's body and can also contribute to the vehicle's aesthetics.

In contrast, quarter panels are the exterior panels that are located directly above the wheelhouses and cover the sides of the vehicle. While they are important for the vehicle's design and structural support, they do not specifically house the rear wheels themselves. Sail panels are used primarily in the rear part of the roof area of the vehicle, contributing to its aerodynamic shape and visual appeal, but they are not related to the rear wheel assembly. Fenders can also be involved with wheel housing, generally referring to the body panels that frame the wheel wells, but the specific component that functions as the housing for the rear wheels is indeed the quarter wheelhouses.