Add an option to show or hide car accessories through a bodywork upgrade. This would work similarly to how factory bumpers can be hidden/removed in some older model cars.
The upgrades:
-Upgrade to hide/remove car antenna(s).
-Upgrade to show passenger side mirror on older cars which did not have a passenger side mirror from stock.
These options can give cars a more modern look if desired.
The addition of the passenger side mirror can be useful for those who use the interior cam along with giving the car a more symmetrical look.
The option to hide the antenna(s) on a car can help in making them less distracting when driving along with giving the look of a more updated classic.