Center Console Proper Mounting

I dont know about 68 but on 70+ the floor pan will have dimples for the grommet screw holes and a dimple to mark the center for the linkage hole. I use a knock out punch to make the big hole. The hole will be real close to the screw holes so its got to be centered perfectly.
The console has a cutout on driver side that gets covered with a flap of carpet. This is for linkage clearance.
I dont recall if there are locating marks for the console brackets. I usually get my linkage installed and make sure its vertical. Attach the brackets loose to the console then set it in place. Once its where it needs to be you can make some marks.
I think the console brackets are available new now.

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