Why did you want a new motor put on it? Most likely there wasn't anything wrong with the old one that a good servicing and greasing wouldn't cure.
As for the new motor, if it has a stamped metal bracket it is a generic one size fits all unit. I have bought and used several of them and on at least two I had to bend the bracket to put the motor pulley straight with the hand wheel. They just do not always fit properly.
As Rodney said, if the bracket is cast you'll most likely break it if you try to bend it. If it's stamped it can be bent to fit.
Joe