True. They are factory, in the same manner as the 300-Hurst cars were.
I wonder if there was more to the package other than the floor. Maybe a different suspension, brakes or wiring. The 300 Hurst had the same VIN as a normal 300, but had A12 on the fender tag. Superbirds as well had a Road Runner RM VIN. Idk...
Could be the price was special to get a NYC contract.