Thule's lock cylinders lock and unlock with the same key to eliminate the hassle of multiple keys. When ordering Thule One Key System lock cylinder packs we recommend that you purchase additional lock cylinders in anticipation of adding accessories.
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Thule 596 6-pack Lock Cores Instruction Manual (.pdf)
Thule warranty information.
There seems to be a step missing in the instructions between #2 and #3: how to remove the factory installed core locks from a Thule cargo box before doing the installation of the new keyed-alike locks.
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