.......they WILL be the wrong offset and they WILL have a negative affect on the ride.
care to elaborate...
check the offset of the replicas, unless they are ET51 they arent right and will affect the ride quality.
The Monza design is renowned for corroding and quickly! I bet you are only getting a 6 month warrany, ask yourself why! Ask yourself why they are only £300, compared to over £1400 at your dealer and even they corrode!