The Schroth Bolt-In Kit (B23) is a set of bolt in brackets that are usually sewn into 2" Lap belts. Schroth refers to it commonly as a "Rally End" kit and it is designed to be bent.
These Schroth Bolt-In Kits are also commonly used in Porsche applications where space for an Eye bolt is insufficient. This bracket can be bolted to the car, then bent so that a Snap-In bracket can be used to fix the harness to the bracket. The use of these brackets is in many applications where stock mounting locations do not leave sufficient space, or if the thread pitch is different from the eye bolts.