I was using the Geno's Garage Chassis Cab locking green anodized fuel cap on mine- it is nice but it is a bit expensive.
On the drive home from getting my flatbed installed, it worked its way loose..
searching I found other options not as expensive, but not as nice quality either.
Guessing the installers of my bed were not familiar with how to "snug it down".
I am using the big ugly stock one again now until I pull the trigger on another...
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