The 1612035-2: The 2.20 mm pitch is the key dimension for footprint matching — it sets the center-to-center spacing of the contacts. The housing itself carries no contacts; the buyer must order the matching tab terminals separately. The natural PBT insulation material is a standard choice for general-purpose interconnect, offering a good balance of mechanical strength and chemical resistance for indoor equipment.
The 1612035-2 is the housing only — the crimp tab terminals that go inside it are a separate line item. If your BOM calls out this order code and the terminals are not listed separately, the harness build stops when the housing arrives empty.