Can anyone tell me more about the ones I see on the early cars? What model is being used? How they are mounted , U-bolt or surface? What glass is best for street use, flat or convex and what size 3.5 inches or 4. Any good sources on where I can buy one? Any information would be greatly apperciated, I know some of the R Gruppe guys have them installed on their cars.

Thanks,

Kevin

R Gruppe #76