Combine rice, contents of seasoning packet and water in cooking pan.
Bring to a vigorous boil. Reduce heat, cover and simmer until water is absorbed, about 5 minutes.
Cover and quickly cool in shallow pan.
Add carrots, celery, raisins and onions.
Combine mayonnaise, sour cream, and lemon juice. Stir into the rice mixture.
Chill thoroughly before serving.
Measurements and timing are designed only for Uncle Ben's Fast Cooking Rice Pilaf, Original Rice Pilaf, Fast Cooking Spanish Rice, Long Grain & Wild Rice Blend, and CONVERTED Brand Rice