The one that is included with the iPad 3 doesn't include LTE support. So I need one from an iPad 4. The easiest way is to install iFile on your jailbroken iPad, and then go to /System/Library/Carrier Bundles/iPad
Hit the edit button, and select TMobile_US.bundle, then tap the zip icon. Then you can select the zip file, and put it in your Google Drive, then put it on your computer, and attach it here