663.33—Description of post-delivery audit.
         A post-delivery audit under this part includes—
    
    
    
        
        (b) 
         A post-delivery purchaser's requirements certification as described in  § 663.37 of this part; and
    
    
        
        (c) 
         When appropriate, a manufacturer's Federal Motor Vehicle Safety Standard self-certification information as described in  § 663.41 or  § 663.43 of this part.