two-(the better way)
Take off the center trim, and take out te screws holding the vents into place. you will need a stubby screwdriver. and there are two or three screws holding each vent in place. once all the screws are out, just pull the vents out form the fornt, and unclip the rings.
I just did the center vent ring mod today, on my `04 Tib.
You have to remove the vent to get the trim off, then
pop the new trim ring onto the vent and replace vent.
Like they say, it's not the easiest to do.
One screw fell out before I could grab it and it landed in the nether regions of the console.
I don't know if I can retrieve that screw but I replaced it with a screw I had
leftover from my billet grill install.
i removed the first vent by unscrewing it and after i was done screwing it back i was pissed enough at the screws that i just took a screwdriver and broke the old one off and poped the new one on. i wouldnt recommend either method this mod sucked to do!:3_nosthum