I finally bought smoked taillights for my 89 full size. I want to upgrade my bulbs to LED. All I'm shown for that year is an 1157. I don't have that style, I have the blade type. The bulbs I have are T2356. I can't find a cross reference guide to show me what number to go with. A local shop in my town was able to do so and they came up with 3156. Everytime I look up bulbs, I'm told it does not fit my vehicle. They look identical, but I don't want to spend money just to find out they don't work. Can one of y'all help a newbie out with this? Just need the backup light bulb in white. What is the correct part number?