The phrase "exterior package" refers to the outer part or appearance of something. It includes the design, materials, colors, and overall look of something from the outside. Full definition
The new S line exterior package sports a new, honed look. (topspeed.com)
It offers one of the most appealing exterior packages of any car on the road, with a suspension configuration that is just short of competition grade. (bestride.com)
These are visually distinguished by a «dynamic exterior package» with front and rear elements inspired by the S8, with side skirts and 19 - inch alloy wheels. (evo.co.uk)