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Not sure where you can purchase something like that but you should be able to make your own blanks easily enough. If you decide to make your own make enough so you can have a bunch on hand. Use them to make zero clearance inserts for the different sized dados you think you'll need and also for each of your regular saw blades if you'll be acquiring different types of blades, i.e. ripping blade, crosscut blade, or general purpose blade.
~~Don't worry about old age; it doesn't last that long.