This is a new CNC-machined layshaft bulkhead made from premium Swiss 7075 T6 aluminium for the Xray T4 touring car. It allows removal of the front, rear or both screws that connect the top deck. This allows for more chassis flex and is recommended for low or very-high traction tracks.
#303056 Xray T4 Aluminium Layshaft Bulkhead Closed L/R – Orange
Source: Xray