I don't have the three groove version, but the same shifter will work. I used the one sold by Patrick's and it works great. It is a Hurst shifter with some small mounting modifications made by Patricks to mount it up near where the reverse light switch is mounted (the switch has to be removed and replaced with a plug of some sort.
The biggest issue I had with the modification is with the brakes. If you convert to a dual master setup the shifter does not give you much room (about an inch) for the brake lines coming out of the master. It is a tight fit, but it can be made to work.
Hope this helps. Good Luck.
