Just fit the boot and ring over the shifter and align so it looks right. Mark the outer diameter of the ring with chalk and remove the boot/ring. Replace the ring without the boot and align with the chalk marks. Mark the inner diameter of the ring with chalk and the remove the ring. Trim the carpet to fit under the ring while not letting it hang into the boot area to far. The trimming will be covered by the boot/ring at final installation.
Its easier after removing the shifter handle, feel where the shifter hole is and cut a X about 1" each way. Put the shifter back in, then the rug, place the trim ring and cut 1 " less all the way around. I don't like getting under if I don't have to like to yank my 12 bolt 411 posi rear to weld a cracked tube
Since the shifter handle is a PITA to remove, I just folded the carpet in half, and aligned the left side. (I used the dimmer switch hole as a starting point) Then cut a small X in the right spot, and insert the carpet over the handle. Final alignment by cutting a little on the carpet to allow it to slide in the necessary direction until you get everything the way you want it. Then final cut slightly larger than the inside of the trim ring.
Remember, on originals, the rear of the front carpet touched the front feet of the seat brackets.
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