Corbin Fleetliner Lock Replacements
The locks which come in the Corbin Fleetliner bags are plastic, and don't always lock well. Some people have also had issues with them leaking. There are replacement barrel locks available which are made from metal instead of plastic, and they twist to open, instead of push to open.
D B ROBERTS COMPANY PART#93-10-102-50 METAL LOCKS REPLACEMENT FOR CORBIN BAGS
800-800-6887 and ask for sales or email Amelia in sales at: firstname.lastname@example.org
They list in the DB Roberts E-Store for 28.88 each but I purchased them for $20.75 each with 15.50 for shipping to Nashville, TN.
Here's another link to available lock styles from Southco and discussions: