RNL M-SERIES For 2011 Chevrolet Silverado 1500 LTZ | eBay
BAKFLIP MX4 15-18 GM Silverado,Sierra & 2019 Legacy/Limited 5.9ft Bed (2014 1500 Only, 2015-2019 1500,2500,3500) - Truck Access Plus
UnderCover 07-13 Chevy Silverado 1500/2500 HD 6.5ft Ultra Flex Bed Cover - Matte Black Finish - Down East Offroad
2011 Chevrolet Silverado Bed Caps – Wade Auto
Amazon.com: Gator EFX Hard Tri-Fold Truck Bed Tonneau Cover | GC14020 | Fits 2019 - 2023 Chevy/GMC Silverado/Sierra, works w/ MultiPro/Flex tailgate (Will not fit Carbon Pro Bed) 5' 10" Bed (70") :
BAK Revolver X2 Tonneau Cover | RealTruck
2011 Chevrolet Silverado 1500 Roll Up Tonneau Cover - Maximum Truck Bed Protection & Utility | WeatherTech