If you are mounting the shifter on top of the floor you will need a slot in the floor for the quad arm to pass through.
How to install aftermarket floor shifter.
B m floor shifter install in a 1999 gmc sierra classic 350 with a 4l60e.
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The shifter is installed on the tunnel here which was then marked in order to cut a slot for the arm to pass through.
After everything s connected the cable needs to be secured.
Once the floor s opened up you can connect the lever to the floor shifter and then the cable to the lever.
For me it was easier to connect the cable to the lever first and then feed the lever up through the floor and bolt it to the mounted floor shifter.
The top plate has a number of different mounting holes that allow you to mount the plate as far back or forward as you need and allows you to do the same with the shifter on the top plate.
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Simply install them at the required angles to fit your tunnel or floor.