8 C.F.R. § 101.4
Registration procedure
The procedure for an application for creation of a record of lawful permanent residence and a Permanent Resident Card, Form I-551, for a person eligible for presumption of lawful admission for permanent residence under § 101.1 or § 101.2 or for lawful permanent residence as a person born in the United States to a foreign diplomatic officer under § 101.3 is described in § 264.2 of this chapter.