The official GM/Chev parts website shows the same part# for low beam bulbs for the 2021 as for the 2018. Quite unimpressive, given it's "poor" performance ratings by more than one non partisan vehicle testing site. So, one question answered.
The CARID folks, so far, have been ropa dopey on their "5 year warranty". I can't do the extensive self diagnosis they want, with swapping left and right side components, because I have another brand of LED on the left side (emergency replacement). IMO, for their reduced cost, they could send me on of each of the 3 components as good customer policy. If they don't come thru today, then it's a bad review for hem, and I'm going to shell for 2 more LED's, from the well thought out recommendations on this board. Install one, keep one as spare.
Sorry to drone on, but I can't get past Chev's continued denial of repeated, documented, 3+ year old dope slaps. These factory lights are unsafe, both from their lack of power, and from blinding other drivers with our excessive use of brights. And the LED aftermarket solution makes vehicle ownership significantly harder. We travel, and any spare part that you must carry with you - as opposed to buying at the nearest auto parts store - is no good.