I purchased my used hard doors for my Jeep CJ-7, and they did not come with a key. After shopping around the local auto parts store for some time, I was able to find a match that allowed me to rekey my doors.
This is the door that I installed the locks in In looking for replacement locks, I couldn't find any for Jeep vehicles, so I went to Trak Auto and bought the Ford Door lock set DL15900. This is just a standard Ford door lock kit that looked a lot like my Jeep locks
The first thing that you need to do is take off the door handles and the windows crank, then pull on off the door fabric. You can get this off by
starting in one corner and pulling on it all the way around until it pops out.
Now you need to slide off the C-clamp that is on the lock, this will allow you to pull the lock out of the outside of the door. This clamp is pretty hard to see, it's tucked back in there pretty good.
You will need to use pliers and break off the little piece of metal on the new lock (remember, this is a Ford lock). This should allow you to put the small door clip back on the lock, with the C-clip, then place it back in the door.