You could get a cable with RCA on one end and BNC on the other or get a RCA right angle and a straight BNC to RCA adapter.
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I work as as AV professional and have never seen that exact 90 degree configuration. You can easily do it with two adaptors however - RCA F to M 90 and then a straight F BNC to M RCA. The depth (at the 90) would be the same, just a bit longer in length. Or, you could reterminate the cable end to an RCA.