This pitman arm bushing has a steel core as original and fits 1939-1948 Chevrolet passenger cars with independent suspension. FOUR REQUIRED PER VEHICLE. Replaces GM# 599643. Top Quality - NOTE: 1939 straight axle car models (JB) used a larger bushing and only two per car. This item is not reproduced, however, we can sometimes find old stock of this bushing. Contact us to see what is available for this design.