SDS shank chisel bit

Does anyone make an SDS shank chisel bit for a hammer drill that is 1/2 inch wide? I have found some such as the DeWalt DW5834 1" x 12" Cold Chisel SDS Max Shank, which is twice as wide as I can use. Also found some that are 3/4 inch but are still too wide.
Who makes such a bit?
Where can I get it?
Thanks.
Steve
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