Abstract This paper investigates P-stranding under A′-extraction in spatial PPs in Molise Slavic (MSL). After showing that P-stranding bijectively correlates with dative case on the Ground argument of P, I argue that the cases of extraction at stake instantiate grammatical convergence in the form of “pattern replication” (Matras & Sakel 2007). A′-extraction is licensed by the presence of borrowed additional functional material valuing and interpreting K(ase). The richer structure allows for KP to move out of the PP Phase without violating Anti-Locality. Both Italian and MSL secondary Ps displaying P-stranding are characterized as instantiating one of two possible structural options for P-stranding. The alternative structure is argued to be instantiated in Germanic, consistently with existing proposals (Abels 2012). The choice between the two options, as well as the productivity of the selected option in a given grammatical system, is a matter of (micro-)variation in the availability of functional vocabulary.