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You can do a search on it, but I seem to recall that they are alike. I think the locksets are the same as one from a storage box on an RV, so check out an RV parts department or check out a locksmith shop, if you have to replace the lock. Let us know how it goes.
If it's not locked go to the loco Lowes an get a file cabinet lock set.
If it's locked and you don't want to mess up anything then bit the bullet take your truck to a locksmith..
I keep a jack an tow chain along with a grease gun etc. in mine and keep the key on my key ring at all times.
This way the key don't get lost, perhaps you should keep your side box key on your key ring also..
Alex from GA what did for my 67 f-100 that has locks on my wheels. i have a pill bottle in my glove box that is big enough to hold the key for the locks. you might also think about putting a spare key under the body somewhere. use a zip tie or a stout piece of wire to hold your keys.
The old magnetic hide a key boxes sit nicely inside the frame rails where , I keep my extra keys there also for over 30 yrs now.
But a person must remember to changed keys when you install a new lock..
Orich