i'd go with v'mania. Biff is really helpful. The lack of a metal strip across the top of the window is nice when you're cruzin with top off (nothing to block your view). Fit may be finicky as all of our cars are handmade. I had to tweek the right window to fit correctly, and I had to send the driver's window back to Biff for adjustment, But I think that my viper is about as out-of-whack as they get. If you're concerned with fit...definately choose Bif and V-mania as customer service is excellent.