Section 1037.1 - Applicability(a) The regulations in this part apply for all new heavy-duty vehicles, except as provided in § 1037.5 . This includes battery electric vehicles, fuel cell electric vehicles, and vehicles fueled by conventional and alternative fuels.(b) The provisions of this part apply for alternative fuel conversions as specified in 40 CFR part 85, subpart F. 81 FR 74048 , Oct. 25, 2016, as amended at 88 FR 4635 , Jan. 24, 2023; 89 FR 29765 , Apr. 22, 2024 81 FR 74048 , 10/25/2016, as amended at 88 FR 4635 , 3/27/2023; 89 FR 29765 , 6/21/2024