; and (B) a description of the process and criterion that the Secretary will use for determining whether a vehicle modifier plan ensures that a stretch limousine meets applicable Federal motor vehicle safety standards. (c) Requirement Not later than 2 years after the Secretary has released the notice required by subsection (b), a new stretch limousine may not be offered for sale, lease, or rent, introduced or delivered for introduction in interstate commerce, or imported into the United States unless the stretch limousine alterer has developed, and the Secretary has approved, a vehicle modifier plan. A vehicle modifier plan includes the following safety elements: (1) Design, quality control, manufacturing, and training practices adopted by a stretch limousine alterer to ensure that a stretch limousine complies with Federal motor vehicle safety standards. (2) Customer support guidelines, including instructions for stretch limousine occupants to wear seatbelts and stretch limousine operators to notify occupants of the date and results of the most recent inspection of the stretch limousine. (3) Any other safety elements that the Secretary determines to be necessary. (d) Vehicle modifier plan (1) Application A stretch limousine alterer shall submit to the Secretary an application for approval of a vehicle modifier plan in such a form, at such a time, and containing the information required to be included in the notice published pursuant to subsection (b). A vehicle modifier plan required under subsection (a) may be approved for not more than 4 years after the date on which the plan is approved. (2) Review The Secretary may approve a vehicle modifier plan submitted under paragraph (1) on a finding that the plan ensures that a stretch limousine will meet Federal motor vehicle safety standards. (3) Timely consideration of applications The Secretary shall approve or reject a vehicle modifier plan not later than 1 year after receiving an application from a stretch limousine alterer. (e) Definitions In this section: (1)