Porsche 964 Trailing Arm Bushings Kit PR52014P 94410602122 Fits the front left and 166 820 04 74 Fits the front left and right side of 914 4 models from 1970 1971 and 914 models from 1972 through Chassis #4722919032 Features and Benefits:Reduces the oil blow by from the crank ventilationKeeps the oil in the engine while still allowing good crank ventilationVery simple mounting sandwiches between the crankcase and ventilation the lid breather coverUsed on all Hastech race & street enginesRecommended for all aircooled Porsche 911 engines to help reduce oil consumption caused by ingestion of oil laden air into the intake caused by excess crankcase windage and blow by Porsche Silent bloc set for 2 trailing arms 964 (89 94) including assembly tools