Cannot be installed. There were no detailed instructions and they didn't fit properly. I was under the impression that this is a part. It was not said that it consists of two parts. I was very upset that I lost money. I was in the process of moving and forgot to return within the reasonable timeframe. I believe Revain Prime members should get a refund if they return the product in its original packaging and in brand new condition like mine. I shouldn't have lost my money.