Yes, you need very short ones. If you're lucky you might be able to find two-piece bits for 3/8 inch drive, take the bit out of the holder, and use an open end wrench or even a small ratcheting box. It might also be possible to take a two piece bit, saw the top end down with an abrasive cutter, and shorten it enough. The design assumes that the doors go on before the fenders and come off after. With the fenders off, you can do it easily through the holes.