BMW E36 3-series & Z3 Brake Booster (item #1 in diagram). Fits the following models:
E36 318ti Compact, U.S.
E36 318i Convertible, U.S.
E36 318i Sedan, U.S.
E36 318is Coupe, U.S.
E36 320i Sedan, U.S.
E36 323i Convertible, U.S.
E36 323i Coupe, U.S.
E36 325i Convertible, U.S.
E36 325i Sedan, U.S.
E36 325is Coupe, U.S.
E36 328i Convertible, U.S.
E36 328i Coupe, U.S.
E36 328i Sedan, U.S.
E36 320i Coupe, Euro
E36 320i Sedan, Euro
E36 320i Convertible, Euro
E36 323i Convertible, Euro
E36 325i Convertible, Euro
E36 325i Coupe, Euro
E36 325i Sedan, Euro
E36 325td Sedan, Euro
E36 325tds Sedan, Euro
E36 328i Convertible, Euro
E36 316i Coupe, Euro
E36 316i 1.6 Compact, Euro
E36 316i 1.9 Compact, Euro
E36 318i Convertible, Euro
E36 318is Sedan, Euro
E36 318is Coupe, Euro
E36 318ti Compact, Euro
E36 323i Coupe, Euro
E36 323i Sedan, Euro
E36 328i Sedan, Euro
E36 328i Coupe, Euro
E36 320i Touring, Euro
E36 323i Touring, Euro
E36 328i Touring, Euro
E36 325tds Touring, Euro
E36 316i Touring, Euro
E36 318i Touring, Euro
E36 318tds Touring, Euro
E36 318tds Compact, Euro
E36 318tds Sedan, Euro
E36 316g Compact, Euro
E36 316i Sedan, Euro
E36 318i Sedan, Euro
E36 323ti Compact, Euro

Z3 Z3 1.9 Roadster, U.S.
Z3 Z3 2.8 Roadster, U.S.
Z3 Z3 2.5 Roadster, U.S.
Z3 Z3 2.8 Coupe, U.S.
Z3 Z3 2.5i Roadster, U.S.
Z3 Z3 3.0i Coupe, U.S.
Z3 Z3 3.0i Roadster, U.S.
Z3 Z3 1.8 Roadster, Euro
Z3 Z3 2.8 Roadster, Euro
Z3 Z3 2.8 Coupe, Euro
Z3 Z3 1.9 Roadster, Euro
Z3 Z3 2.0 Roadster, Euro
Z3 Z3 2.2i Roadster, Euro
Z3 Z3 3.0i Roadster, Euro
Z3 Z3 3.0i Coupe, Euro