PCV elbow.  This is the factory rubber elbow that your PCV valve sits in located on the back side of your valve cover.  
 
2.2 Turbo II intercooled Shelby Dodge GLHS, CSX, CSX-T, Shelby Lancer, etc.
Mopar Part number:   4387568
 
Fits:  Pretty much all cars that are 2.2 Intercooled turbo
 
OR
all 1989 and up 2.5 Turbo I engines
 
This means:  Shelby Lancer, Shelby GLHS, Shelby CSX, Daytona Shelby, Lancer Shelby, Lebaron GTS, (t2) etc...