The Watson Racing 2015 S550 Mustang rear seat bulkhead/firewall is very similar to the 2005-2014 S197 Mustang Bulk Heads that are standard issue on the Boss-S Mustang race cars. Riveted in place, these are essential safety items when using a fuel cell, rear-mounted battery, etc. Lightweight aluminum construction with a medium-gloss black powder coat. Includes access holes for wire harnesses to pass through.