Tunnel protector that protects the heat exchanger while running studs.
Protectors are 1” x 1.5 ” high and run the entire length of the tunnel. This is a T-nut design that installs in minutes.  Includes 4 pieces for the main section and 2 or 3 more additional with rear option selected (2 is most common). 
 
The rear sections will not work with existing factory rear option installed.