I've seen that there are THREE different part numbers for a 2016 GMC Acadia depending on which 'base' attaches to the roof of your SUV. Unfortunately, there is no "easy" way to determine the base part number without ripping apart the back of the "trunk/roof". I saw several reviews that another part number (ACDelco 10370211) - which was the most popular in my search engine - had a screw (inside the antenna) that was TOO SMALL to screw properly into the base. I took a chance and ordered one of the OTHER part numbers. The part number (ACDelco 23169266) fits my 2016 GMC Acadia SLE2 perfectly. I chose wisely.
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