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You want the No Credits OP (NCOP) and No Credits ED (NCED) versions of both the OP and ED which are released along with one of the Blu-ray volumes of the show once it's out on BD. Any decent BD batch release will have the NCOP and NCED bundled into it, so just look for complete BD batches of a show. You can also maybe find the NCOP/ED floating around on their own but they are less likely to have seeds than a full BD batch.