System Features Air conditioning and alternator bracket set for 1937-54 216 235 or 261 engines. Also fits 1955 First Series Truck 235 or 261.Brackets come with hardware and instructions.Requirements:1) 1937-54 All or 1955 1ST Series truck engine.2) 1954-62 3/8″ groove balancer.3) 1954 3/8″ groove water pump. On 1937-40 engines use a pulley from the 1954 pump.4) Alternator.5) SANDEN 508 (SD5) type compressor. other compressors may work. Compare case dimensions.6) Two grooves needed on the A/C compressor.Does not work with:1) 1955-62 engines.2) 3 x 1 intakes. Instructions Installation Instructions download Vehicle Fitment warning California Proposition 65 arrow_drop_down WARNING: California proposition 65