In my case, I did some searching online and struck out as others have. So I went to a local locksmith and he couldn't find a blank for either the S324 (bag to bike) or the S342 (bag latches) that I need. But he sent me to another shop, told me to ask for Ralph and tell him Mike sent him. This guy was very diligent and found some blanks. He made two for me. He also looked very hard to find suitable blanks for the case latches but had no luck. He actually enjoyed the 'new challenge' and the price was great. I have a new go-to guy out here! So I'm half way there. I will continue the pursuit...
Ron in AZ
PS. If you strike out with this approach and are desparate, PM me and I can help you out from here.