Yes...on a front mount use the rubber pieces....you will need to cut holes in the rubber for the pipes...but anything you can do to box in the intercooler to get more air the better it will be...for my front mount though I flipped the piece that attached to the grill...if you mount it normally the rubber will block the bottom half of the intercooler...since I did that the rubber piece wasn't long enough...so I took an aluminum strip 1/8"thick x 3" wide...mounted that to the rad support then attached the rubber piece to the strip...you can also just get some new rubber from this place:
Old Buick Parts - CARS. Inc.
...they have big pieces...just use the stock pieces as a template...cut the one goes from grill to rad support longer...the material is the exact same as the OEM stuff...rubber imbedded with fiber...can't tear the stuff...