My Z came with cloth seats and I purchased a set of custom leather head rests to match my Z's body color. I am having trouble installing them. When I called the manufacturer they suggest either I remove the cloth fabric and compress the foam to fit the headrests, or placing the headrests in a bag and using a high vacuum suction to rmove the air and compress the pieces. These did not work so I am baffled. What do you gents suggest??