Used for rear carb on the 1964 to 1966 and the center carb in 1966. Some carbs had the 90 degree as cheap substitution. The 105 degree fitting kicks the line out, away from the carb. The 1966 tripower used 2 of the 105 degree fittings center and rear carb. The 1964 and 1965 tripower only use one, on rear carb.