Air Conditioning

I had an aftermarket air conditioning system installed on my car. There is excess shaking when I turn on the air conditioner while at idle. At stop lights I can feel the vibration through the steering wheel. I noticed that the accumulator/dryer has not been bolted to the sidewall of the frame. There is an thin plate/bar that extends from the accumulator where a grommet is to be placed and a bolt is to be inserted to be tightened against the metal of the car (I call it the sidewall). That was not done. The end of the bar where the grommet is to be inserted does not line up with the bolt hole to tighten down the accumulator/drier. First, should the accumulator/dryer be bolted down to reduce vibration? Also, since the hole does not line up, should there be an adapter piece?