# Bilstein 21-030406 B4 Series Twintube Strut Insert for 1973-1992 Audi 4000 Quattro and More ### Performance Overview Bilstein B4 Shocks and Struts are ideal as OEM replacements, and are made to guarantee factory quality performance. They feature a large-diameter body, and rely on track-proven and road ready suspension technologies. The shocks are available in a classic black finish, and are backed by a limited lifetime warranty. Standard Suspension with 50mm Outside Strut Diameter. ### Key Features - B4 Series OE Replacement Suspension Strut Cartridge ### Vehicle Fitment - 1984 Audi 4000 Quattro (Note: S) - 1985 Audi 4000 Quattro (Note: S) - 1986 Audi 4000 Quattro (Note: Cs) - 1987 Audi 4000 Quattro (Note: Cs) - 1988 Audi 80 (Note: Base) - 1989 Audi 80 (Note: Base) - 1990 Audi 80 (Note: Base) - 1991 Audi 80 (Note: Base) ### FAQ **Will this fit my vehicle?** Please verify your year, make, model, position, and any fitment notes using the compatibility list above before purchase. **What part number is this?** The listed part number is 21-030406. **Is this product designed for direct replacement?** Yes. This product is intended to match compatible vehicle applications listed in the fitment section. **Should I confirm fitment before ordering?** Yes. Always compare your original part, position, and vehicle details with the fitment chart before ordering. ### Common Searches - B4 Series Twintube Strut Insert for Audi 4000 Quattro - 21-030406 fitment - Bilstein B4 Series Twintube Strut Insert - 1984 Audi 4000 Quattro B4 Series Twintube Strut Insert ### Vehicle Fitment Table Year Make Model Position Fitment Precision Note 1984 Audi 4000 Quattro S 1985 Audi 4000 Quattro S 1986 Audi 4000 Quattro Cs 1987 Audi 4000 Quattro Cs 1988 Audi 80 Base 1989 Audi 80 Base 1990 Audi 80 Base 1991 Audi 80 Base 1992 Audi 80 Base 1980 Audi 4000 Base 1981 Audi 4000 Base 1982 Audi 4000 Base, Gt, S 1983 Audi 4000 Base, Gt, S 1984 Audi 4000 S 1985 Audi 4000 S 1986 Audi 4000 S 1987 Audi 4000 S 1981 Audi Coupe Base 1982 Audi Coupe Base 1983 Audi Coupe Base 1984 Audi Coupe Base 1985 Audi Coupe Base 1986 Audi Coupe Gt 1987 Audi Coupe Gt 1973 Audi Fox Base 1974 Audi Fox Base 1975 Audi Fox Base 1976 Audi Fox Base 1977 Audi Fox Base 1978 Audi Fox Base 1979 Audi Fox Base 1983 Audi Quattro Base 1984 Audi Quattro Base 1985 Audi Quattro Base 1974 Volkswagen Dasher Base 1975 Volkswagen Dasher Base 1976 Volkswagen Dasher Base 1977 Volkswagen Dasher Base 1978 Volkswagen Dasher Base 1979 Volkswagen Dasher Base 1980 Volkswagen Dasher Base 1981 Volkswagen Dasher Base 1982 Volkswagen Quantum Base, Gl 1983 Volkswagen Quantum Base, Gl 1984 Volkswagen Quantum Gl, Wolfsburg Edition 1985 Volkswagen Quantum Base, Gl 1986 Volkswagen Quantum Base, Gl 1987 Volkswagen Quantum Base, Gl 1988 Volkswagen Quantum Gl ## Details - **Price:** 100.83 CAD - **Vendor:** Bilstein - **Type:** B4 Series Twintube Strut Insert - **Tags:** 1973 Audi Fox, 1974 Audi Fox, 1974 Volkswagen Dasher, 1975 Audi Fox, 1975 Volkswagen Dasher, 1976 Audi Fox, 1976 Volkswagen Dasher, 1977 Audi Fox, 1977 Volkswagen Dasher, 1978 Audi Fox, 1978 Volkswagen Dasher, 1979 Audi Fox, 1979 Volkswagen Dasher, 1980 Audi 4000, 1980 Volkswagen Dasher, 1981 Audi 4000, 1981 Audi Coupe, 1981 Volkswagen Dasher, 1982 Audi 4000, 1982 Audi Coupe, 1982 Volkswagen Quantum, 1983 Audi 4000, 1983 Audi Coupe, 1983 Audi Quattro, 1983 Volkswagen Quantum, 1984 Audi 4000, 1984 Audi 4000 Quattro, 1984 Audi Coupe, 1984 Audi Quattro, 1984 Volkswagen Quantum, 1985 Audi 4000, 1985 Audi 4000 Quattro, 1985 Audi Coupe, 1985 Audi Quattro, 1985 Volkswagen Quantum, 1986 Audi 4000, 1986 Audi 4000 Quattro, 1986 Audi Coupe, 1986 Volkswagen Quantum, 1987 Audi 4000, 1987 Audi 4000 Quattro, 1987 Audi Coupe, 1987 Volkswagen Quantum, 1988 Audi 80, 1988 Volkswagen Quantum, 1989 Audi 80, 1990 Audi 80, 1991 Audi 80, 1992 Audi 80, 21-030406, Automotive Parts, B4 Series Twintube Strut Insert, Bilstein, Bilstein Suspension, Direct Replacement, Performance Suspension ## Variants | Variant | Price | Available | |---------|-------|-----------| | Default Title | 100.83 CAD | In stock | ## Images - Bilstein 21-030406 B4 Series Twintube Strut Insert for 1973-1992 Audi 4000 Quattro and More --- > Source: [Standard Auto Part](https://www.standardautopart.com/products/bilstein-audi-4000-quattro-suspension-strut-21-030406) > Updated: 2026-07-16