Some European vehicles with double-sized openings require a special “cage” bracket for installation, but this bracket is not included with Pioneer double-DIN receivers.
This Pioneer ADT-VA133 mounting kit includes all you need, including a mounting cage, two side-brackets, rear-support bracket, trim ring, mounting hardware, and removal tools.
Trim Ring: Width = 7.405″, Height = 4.655″, Depth = 0.455″
Cage: Width = 7.325″, Height = 4.605″, Depth = 3.115″