The phrase "exterior bits" refers to the outer parts or surfaces of something. It is used to describe the visible and outside components of an object or structure. Full definition
Other black exterior bits include tinted taillights, satin black rear grille strips, and the aforementioned gloss black exhaust tips. (automobilemag.com)
Of course, if you were to strip away most of the racing - related exterior bits, you'd probably end up with what the customer version will look like. (paultan.org)
The interior trim package costs RM 7,888, the carbon fiber exterior bits package costs RM 10,888 and the BMW Performance front and rear bumper and skirts cost RM 8,888. (paultan.org)