2019 Sierra and Silverado not the same truck bed

[GormanAZ]

Since we replaced our 2019 Sierra (bent push rod, can’t run back up camera, SD card reader for Nav broken) with a better truck (2019 2500 Diesel) we need to sell the ARE topper shell. Guess what, it does not fit a 2019 Silverado (we tried it). The rear corners are a larger and sharper radius on the Sierra and leave an inside gap on the Silverado. All other spots fit perfectly. So GM now has two different truck beds and toppers are not interchangeable within model year. Just some more brilliant design work by GM!

[OnTheReel]

Ayuh...the 2019 Silverado HD you have now is the old K2 body style, so if your Sierra was the new body style (T1), it’s not surprising that the topper won’t fit. The whole truck was redesigned.