The 2138557-1: The black colour is the only option on record.
Friction lock and harness fit
The friction lock on this plug engages with the mating receptacle's ramp to resist accidental separation under light vibration or cable snag. It is not a locking ramp or latch lock — the retention force is lower than a positive-latch design, so for high-vibration environments (automotive underhood, heavy machinery) a locking ramp housing such as the sealed 1-1703532-1 would be a more secure choice.
