It uses a regular hinge skull design aimed at reducing pressure behind the ears, sized at (best for medium to large face shapes). Aesthetics:

The terminal block supports:

Decomposes in soil water or may volatilize from dry surfaces

: Typically indicates a new version0;8da; , a "new old stock" item, or a revised instruction set for a pre-existing part. 0;2a;

(Example table to use when comparing 3+ options — provide specifics if you want actual parts compared.)

Here is a solid review of the NGK/NTK NO2 Sensor (LMVV038):