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This may help. Not the difference in the "cutout" portion in 28-29 and 30-31. Also notice the triangle shape on the sedan fenders that is not there on the other fenders.
The first is 28 29 coupe and roadster
next is the 28-29 sedan
third is the 30-31 coupe and roadster
next the 30-31 sedan
and last is that triangle shaped on the all sedan fenders