1969 Chevelle L-78 convertible
 

A couple of friends of mine went to a used-car dealer last weekend and bought a car. While there they spotted a matching numbers L-78 convertible with a M-22 transmission, that was sent over the pond in the mid seventies.
Could anyone guesstimate how many L-78 convertibles that were built and how many that are known to still be around ?

Thanks
Anders