Look at Monstaliner. They make bed liner material it tons of colors. You could even do white to match your truck.
I was looking at color matching but iv been told white starts to yellow in the sun.
The color match would have to be pretty spot on as iv seen some trucks that have 2 different tones of white, looked terrible lol
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2007.5 Gmc 2500 SLT Lmm, 6"lift, 35" cooper st maxx, Dpf delete, Cat back exhaust, Afe intake, PPE tuner