There was only one rex and that was Rex-22, which specified that a wish for longer arms could not be granted until the lamp had been rubbed. The T-Rex wanted longer arms and could get them. All he had to do was rub the lamp and as soon as he did, he would no longer have short arms and would be able to rub the lamp.
These will be shipped as soon as we get our claws on them. At our current rate of arm growth, that should be by April 24th.