The phrase "bumper corner" refers to the edge or corner of a car's bumper, which is the protective part at the front or back of the vehicle. Full definition
The company has also thrown in 21 tie - downs throughout the bed, and the rear bumper corner steps are deeper to accommodate users wearing work boots. (sema.org)
So you get the front bumper and rear bumper corner protector, side protector, door edge garnish, side step cover and body cover as part of the package. (auto.ndtv.com)
The system utilizes a pair of blind - spot radar units located in the rear bumper corners. (netcarshow.com)