I like Greg's suggestion of using the 2 X 2 X 1/4 angle iron. Just use a forged lifting eye and grade 8 3/8" bolts and you should be good to go.
If the angle iron idea is not to your liking go with 2 X 2 X heavy wall steel square tubing.
If the angle iron idea is not to your liking go with 2 X 2 X heavy wall steel square tubing.