These adapters are built for engines where the installation of the manifold creates limited space to install a DBW adapter and throttle body. They have a 33.3 degree angle from the manifold flange to help get your piping started in the right direction.
These adapters have a Bosch 82 Flange on both sides and are suited to manifolds with a Bosch 82 throttle body flange or where a Bosch 82 adapter is already installed.