My passenger seat's seatbelt latch has a ribbed stalk, but my driver's seat is flat and smooth. My 2001 was like this, and so is my 2003. Weird...
Because the passenger seat is not used as much, and it is folded forward more often than the drivers seat. Due to this unusual wear pattern, it's made of a special covering based on kangaroo hide. The pocket is an unfortunate holdover. Ever notice how the empty passenger seat tends to bounce a bit?why does only the passenger seat have a pocket on the back?