Few things are less rudimentary on stepside trucks than a chain-link latch pin (hook) setup. Obtrusive, clunky, and the "best" way to scratch up a nice paintjob—yet they were the norm for GM stepsides ...
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How to Install a Deadbolt Lock

Single-cylinder deadbolts (keyed on one side) will work fine for most situations. Double-cylinder deadbolts (keyed on two ...