What's the 2015 gmc sierra tail light bulb size?

There is a total of four bulbs in the taillight assembly on the 2015 GMC Sierra. The bulb furthest to the outside is the sidemarker lamp and it takes a 194 bulb. The parking brake and turn signal bulbs are on the top and bottom and these are 7444 bulbs. The center bulb is for the reverse light and this is a 1156 bulb. To change the bulbs, You will need a T-15 torxBit socket and the ratchet or hand driver. Lower the tailgate and remove the two screws, one above and one below the tailgate cable. Once the screws are removed word taillight assembly and pull it away from the truck. Rotate the bulb socket counterclockwise to release them from the assembly. The bulbs pull out of the socket.