This is the sliding door lock barrel for late bay window VW Kombi from 1974-1979. If you don't have a working key for your barrel or if you barrel is missing or broken this will solve your problem. The key will be new and coded different to your other locks. Most locksmiths will be able to recode the barrel to work with your existing keys.
Note: This is a quality Brazilian part but to work with left sliding doors on right hand drive vehicles the peg piece on the back of the lock will need to be swapped from your existing lock barrel.