INFAMOUS SCANDAL OVER 3157 LED STOPLAMP BULB!
Vendors listed in writing the bulbs are a direct replacement for standard incandescent 3157 bulbs that function BOTH for a tail and stop/turn lamps.
THEY LIE their ass off in writing to customer direct inquiries about the bulbs compatibility.
So beware before buying. When Detroit decided to abandon 1157 and 1156 bulb bases they opened the door to this fustercluck world of "It fits upside down".
This warning comes from the world of reality, not conjecture. It applies to 1156 1157 duty 3156 and 3157 bulbs.
Years ago the FTC and DOT would have issued warnings. Now they issue politically correct propaganda.