That's the shifter I have..... not sure about how it will fit in the stock console...I am currently in the middle of putting it in my car, now I have a 4th Gen 6 speed console (98 formula) and I can tell you it isn't fun... I never used the plastic piece and leather boot that came with the hammer shifter.
I had a choice to make...I could either cut/trim my console to make it fit or cut/trim the shifter. I choose the shifter... since none of my trimming would be seen anyway as it would all be covered with the shift boot. I had to remove a fair bit of the "extra" metal on the shifter that was getting in the way in order to make the top shift plate to sit down flush. But after what seemed like an eternity of cut/fit/remove/, repeat... I managed to shave off just the right amount to make it work.
To mount it to the floor you will have to drill new holes.... this shifter will not bolt down in the stock holes.... I opt'ed to use a couple of small plates which I fitted under the stock plate and drilled two new holes... it bolted down just fine.
Next I will have to cut/trim my stock shift boot, just a small trim, roll it down a little and re-sew it, not a big deal.
There is also a little bit of re-wiring that needs to be done... the Park/Neutral switch is easy, all that needs is the micro-switch on the hammer shifter tied to ground and the orange wire that runs back to the ECM.
The reverse lights in stock configuration has +12 volts running through the gear selector switch when the gear shift is put into reverse... rather than run +12 volts through my micro-switch I will just use an isolation relay and have the micro-switch supply the trigger ground for the relay. Makes more sense to run +12volts thru a relay than thru a switch.
The hatch release for some retarded reason goes through the gear selector switch as well... seems that in stock configuration you can only pop the hatch when the shifter is in PARK or NEUTRAL. Guess it cuts down on those moments when while driving down the highway I decide to pop the hatch to escape or something

When in Park/Neutral the gear selector switch provides the ground side to the hatch release relay. The wiring is fairly heavy and by looking at the schematic there is a lot of current (for that brief second when the hatch release switch is engaged) passing through the gear selector switch. So rather than put all of that current through my micro-switch I will use another isolation relay, only this time I will be relaying a ground to the hatch release relay.
It sounds like a lot of work but it really isn't, just tideous small things.... in the end it will be worth it.
Once I am done I will try to do a small write up on it...
Now B&M does make a console shifter that supposedly bolts right into our 3rd gens.... its their Megashifter.... but I don't like the look of it....