From a previous post on VMAG:

The replacement of the transmission shifter is actually quite easy.

The transmission shifter, as you can see, has a square shaft which is actually a square metallic sleeve that covers the round shaft in which you attach the RAZO shifter onto. The trick is to remove the square shaft so that you can actually attach the RAZO shifter knob. To do this, you have to do the following:

Modifying to change the shifters is PERMANENT and you can NOT go back to original stock.

You'll need the following tools: a long skinny flathead screwdriver, a regular flathead and phillips screwdriver, a small fine file, a hammer, and black electrical tape or black paint (for cosmetic use only).

If you have decided to do the mod, the first thing you should do before doing anything to the VX is to purchase the appropriate shifters knobs.

Once that's done, all you need to do is to remove the center console, the shifter handle itself, the shifter console cover, and the shifter display (small clear window).

You should be able to trace how far the square metallic sleeve extends far down into the console. The square sleeve is actually spot-welded at two points on the round shaft.

Take a small flat-head screwdriver and insert between the square sleeve and the round shaft where the first spot-weld is located. Tap the screwdriver with a hammer and the spot weld should break loose. Repeat for the lower spotweld and the square sleeve should come off. You may want to file the spot weld breaks on the round shaft to make it smooth.

Assemble the console back together and attach the shifter knobs according to the directions from the shifters. The round shaft is bronze or copper color. To blend in with the shifters I applied black electrical tape aroud the round shaft. You can also try painting the shaft black.