^^^ Correct.
IF the car is a completely original car, a little detective work can help:
Check the spare tire & wheel: black wheel with wheel-cover scratches could indicate it had full wheel covers.
Same for the dog-dish or "poverty" caps.
I'm not certain if that year had body-color wheels for poverty caps and black wheels for full covers.
If there are traces of red paint on brake drums, that would indicate "road wheels" (aka Magnums).
I'm not sure if that also applied to the Rallye wheels.
Tire size may be written on underside of trunk lid, sometimes with R (red-lines) or W (white).
I'm not sure what the callout for white-lettered tires would be.
Google images of untouched original cars, magazine test cars, or the ordering info at Hamtramck-Historical might help too.