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I believe the 9-1/4" rear didn't show up until very late 1974 at the earliest. Both my '74s have 8-3/4 rears in them. My 1975 Daytona has a 9-1/4 rear (5-1-75 build date).
Remember 73 and up rears will have the rubber ISO spring clamping contraption and the spring perches will have the large centering hole... just tack weld in an appropriate size washers (Firm Feel has a kit as well) to use with 72 and previous shock plates.