You can pick up a keyed lock that is a direct replacement for the stock catch.
Simply unscrew it from the underside of the lid and insert the new lock. You will probably have to play with the height of the striker for a snug lock. I picked mine up at Camping World.
You can pick up a suitable keyed tumbler lock at Lowes for under $5. Pull the current unkeyed latch and take it with you. Easy to match to correct size.
__________________
MICHAEL
Do you know what a learning experience is? A learning experience is one of those things that says "You know that thing that you just did? Don't do that."
This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.