A few B16 cars were sent to the factory in 72 and converted to B21 cars (same as B19 but with a different cockpit section), as many key components, such as engines, g/box, wheels and uprights were the same as B21.
The B16S car was the forerunner the B19, so it's highly likely that the B16 chassis was similar to the B19/21 chassis making it economical for the owner of a 1967/8 car to upgrade his 'old' car to a modern race car.
A similar thing happened to the B8 cars converted to make the Gropa 2 Litre GP5/6 race cars with the historic racing scene of the 1980`s when the cars were converted back to more "valuable" B6/8 race cars.
So, Allen, you now have a list of cars that you can create the then and now database.
