This issue has persisted since the first Forza Motorsport on the original Xbox. The body line and all dimensions of this car are incorrect. The front bumper trim is incorrect for the 1994 model year, as it should be unpainted, which was somehow done for Horizon 5, but not for Motorsport. On top of this, the Fairlady Z in Forza is a Japanese Domestic Market model, meaning it is right hand drive, however its windshield wipers are from a left hand drive model.
Z32 Fairlady Z as it appears in Motorsport 2023
Proof for it still having incorrect windshield wiper placement