Since I have a rear turn signal light out I want to replace all rear bulbs. The owner's manual says Turn Signal Bulb is a 3156AK. Auto Zone has a 3156 but it is clear and not amber colored like the old original one I pulled out. Same thing for the Stop/Tail Bulb...the manual calls for a 3157K. The old original bulb I pulled out is clear. Auto Zone has a 3157 but it is amber colored. Is there a mis-print in the owner's manual? Am I missing something? What do the bulb letters stand for such as AK and K? Thanks.