49 CFR §585.111

This subpart establishes requirements for manufacturers of passenger cars, multipurpose passenger vehicles, trucks, and buses with a gross vehicle weight rating of 2,722 kilograms (6,000 pounds) or less to submit a report, and maintain records related to the report, concerning the number of such vehicles that meet the requirements of Standard No. 216a; Roof crush resistance; Upgraded standard (49 CFR 571.216a).