The 3-917808-2: It uses a 10.16 mm pitch between contacts and the same 10.16 mm row spacing, which is unusually wide — that gives you room for large-gauge wire and keeps creepage distances comfortable for higher-voltage circuits. The housing is free-hanging (no PCB mount), terminated by crimping male pin contacts into the rear, and it includes a polarizing key to prevent mismating in multi-connector harnesses.
For the Dynamic D-5200 series, TE typically offers loose-piece contacts (e.g., the 1-917806-1 or similar) that suit the 10.16 mm pitch and accept a specific wire gauge range. Check the wire size your harness calls for and order the terminal part number that matches that gauge. The housing is keyed, so the contact insertion orientation matters — the polarizing feature in the cavity ensures the terminal seats only one way.
Mating half — what plugs into this
The receptacle header carries female contacts that accept the male pins crimped into this housing. The polarizing key on the plug aligns with a corresponding slot in the receptacle, so if your harness has multiple D-5200 connectors, the keying prevents cross-mating. Confirm the receptacle part number matches the 4-position, 2-row arrangement before committing the BOM.