Searched with no definitive answer....what carpet are you using, no one lists an SS carpet to fit the floor hump. I called ACC Carpet today, and they acted like this is the first time they have heard that an SS has a hump. They do list 2 different part numbers for an automatic car, but even the girl on the phone said they were the same. I fear the the 4spd version would be too big and not fit correctly. ACC says try the 65 SS carpet which does show a slight hump, but not the correct shape.