The standard towing eye bolt should be more than long enough
to fit a tow rope/hitch.
I have seen the odd one where a dealer has removed the original
after the vehilce has been towed in, forgotten where he put it at
the end of the day, and popped into the wheel well a towing eye
from a ForTwo (450)...which is shorter and totally inacceptable to
use on a ForFour (454).
(One of my 454's had a 450 towing eye in the rear wheel compartment
which I only found out about when I went to check the tyre pressure
of the spare wheel....I saw that it didn't 'fill' the space in the molding)