I personally am not a fan of Vertical Doors on my Z car, but it's a personal preference. If someone decides they want to put them on their car, more power to them. There probaly is a small niche of Z car owners that like the looks of Vertical Doors and thats probaly why MSA offers them. Granted that niche isn't as large as the people who like looks ZG flares and Watanabe's, but if Vertical Doors makes them why not offer them.