This is the website I use to find out the bulb size it's way more accurate than Amazon https://www.osram-americas.com/en-us/applications/automotive-lighting-systems/Pages/lrgmain.aspx
Bulb size I had to get was 7440 for my 2010 Tahoe
If you have a 2016 yukon it would be 921 for the reverse lights here's a link I found on eBay https://www.ebay.com/itm/122087155911
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