Being an Impalla, you will have an easier time finding mounts that are used in police cars. I would say try Galls (www.galls.com
) and see if they have any mounts for a 2003 Impalla that bolt to the seat bolts. On Crown Vics, these have flanges that go between the seat and the floor, using the seat bolts...no new holes. All depends on how much money you are willing to spend. Also you could try a commercial 2-way radio shop in your area and find out what they use for Impallas...or if any local PDs have them, take a peak in the window.