Renneberg

My truck is a SLT Trim. I think it is actually already LED Turn Signal lights. I went to change out my rear back up light as well and found it was also a non-changeable bulb, just a single plug for the entire tail light assembly. Picture of the truck attached.

Nothing is ever simple... I've got LED turn signal bulbs I want to swap into my 2019 Sierra 1500 and I can't for the life of me remove the turn signal bulbs from the headlamp assembly. Every photo and reference information I find online shows a nice big "fin" to grab onto the back of the bulb connector and turn, it sure looks like my bulb is not removable. What am I missing here? See the attached photo of the back of my head lamp assembly, and a photo of the "fin" everybody else refers to.