What's the 2018 gmc sierra reverse light bulb size?

The 2018 GMC Sierra 1500 truck is going to need use a 921 bulb for the reverse lights. These are a very common bulb size so You shouldn't have any issue finding them in store or online. A pair of them will range in price from between $10 to $20. If You have the option to purchase long life bulbs You should take it because they are more cost effective and will save You the trouble of having to replace them for several years. If You want to take it in to a shop to have them replace these bulbs for You You're going to spend between $130 and $200 to have it done.