[B]Quagmire
I'm not sure your shifter is any different than the rest, if it is on a 451. I own a
Cabrio off the first boat 01/08 and the collar and curved collar base are all one piece as in the photos. The first time I tried to use pliers as shown in the photos it did not work, but turning it counter-clockwise with a clean, bare hand while lightly pulling up on the shifter knob it worked like a charm.
Hope this helps