I seriously doubt that Galco will custom make a holster for you, they are a mass produce shop.
Galco holsters are what I use to "get me by" until my custom leather comes in. As far as a Thumb Break, you may not need one if you have a custom holster. The "properly fitting" holster will retain the gun even upside down. The "trick" is in the boning and stitching. Custom holsters are tight, so much so that you often can't get the gun in them until you "break it in".
If you want a "Thumb Break" or are required to have one due to agency policy, most mass produced holster makers make them in right and left hand versions for certain guns. For me it's harder to find leather because I too am left handed, but I carry a wheelie Off-Duty.
If it's for concealed carry I would strongly urge you to not have/use a thumb break unless you are working "plainclothes" with a high probabilty of rolling around on the ground with a skel.
Biker
