I have the measurements for mine. Looking at the flat tunnel cover rectangle, from the front edge, back to the front of the shifter base, it's 5 inches. From the back edge, forward to the rear of the shifter base, it's 5.25 inches. From the edge on the driver's side to the shifter base, it's 2.25 inches, and from the passenger's side edge to the shifter base it's 4.7 inches. My shifter base is about 2.9 inches wide and 3.25 inches long. Hope this helps.
***Disclaimer- my kick panels, rockers, floor pans, and tunnel cover have all been replaced so location of the tunnel cover could be different from yours.***