A mirror thread is an awesome add so thanks for starting this Pedro. The OEM mirrors are totally different than what comes with the G28 bodies. Both the size and fit of the OEM mirrors differs enough that they really are not an option for the G24 or G28 builders. If I was building an OEM exact car, with original shaped and sized doors, this would be a no brainer and using the OEM mirrors would be the way to go. It's money (a lot of it) well spent since the side mirrors can be a royal pain to deal with and for the G28 builders they can be one of the hardest smaller parts on the car to finish correctly.
Chris