There are also several places that specialize in selling used toppers.
a very large one is in Tavares FL (central FL) And they list them by make of vehicle. Your window sticker says IRIDESCENT PEARL so I guess from that and the pic, it is Pearl White.
IS YOUR BED 5 FT 8 IN, OR 6½ FT
Not being familiar with newer trucks, I watched
this video and learned that a MultiPro (GMC) or MultiFlex (Chevy) tailgate is the two part tailgate and apparently the caps, for whatever reason, are different for them. It may be the length or something else, Dunno. I see your sticker says you have a MULTIFLEX TAILGATE, so you would need to find out what the differences are as far as a cap.
The outfit I linked to has one listed.............
FT-059 Fiber ARE White Pearl (140X) 19-Current Sierra 1500 6.5' Bed (84.5”Lx72”Fx69”R) Multi Pro
The same company lists a bunch of ARE fiberglass cap in white for 5'8" beds but don't say MultiPro/MultiFlex so I'm betting the bed length is different, dunno.
TC-135 Fiberglass ARE Summit White (8624) 19-Current Silverado 1500 CC 5'8” Bed (77”Lx72.75”Fx67.25”R)
TC-137 Fiberglass ARE Summit White (8624) 19-Current Silverado 1500 CC 5'8” Bed (77”Lx72.75”Fx67.25”R)
TC-138 Fiberglass ARE Summit White (8624) 19-Current Silverado 1500 CC 5'8” Bed (77”Lx72.75”Fx67.25”R)
TC-139 Fiberglass ARE Summit White (8624) 19-Current Silverado 1500 CC 5'8” Bed (77”Lx72.75”Fx67.25”R)
TC-140 Fiberglass ARE Summit White (8624) 19-Current Silverado 1500 CC 5'8” Bed (77”Lx72.75”Fx67.25”R)
TC-159 Fiberglass ARE Summit White (8624) 19-Current Silverado 1500 CC 5'8” Bed (77”Lx72.75”Fx67.25”R)
Leer and ARE caps are both quality products but Google tells me that are owned by different companies.
LEER Group, which is part of JB Poindexter & Co (JBPCO), is the largest manufacturer of truck caps and tonneaus in North America, and their well-regarded brands include LEER, Snugtop, Century Caps, and Bedslide. A.R.E. Accessories LLC is a separate company and was acquired by THI Corp.
Charles