Some of the areas of the floor pan that you may have to remove are labeled. Trial fitting is the only way to know for sure if you need to do a little massaging. PAE labeled the bottom side of a real '66 Shelby GT350 so that our readers could see the most likely areas of contact with a late-model overdrive transmission. Also, keep in mind that some convertible models of Mustangs are harder to work on because of the additional factory floor reinforcement. The Xs indicate the area of the trans tunnel that will likely have to be removed, and the arrow shows the direction that the shifter bezel has to be moved.