The red car LSJ 284 is B20S-1606 and was sold recently in the UK, I believe to an American and is undergoing some restoration and overhaul in the UK.
The dark blue car is B20-3476 as for sale at Coy's and previously by other dealers in recent years.
The pale blue car, advertised at
http://www.hi-think.it/luzzago/hipgscheda.php?HIGNIdAuto=10494 is very puzzling. The advert says it is B20S-1283 with engine B20.3790 which is probably not original - this is 5th series car. This is a car which was in the UK in the 1970s and went to the USA - it did previously have the Italian registration on the car advertised. However the car in the photographs appears to be a 4th series body with an early 4th series dashboard and roll rimmed wheels. More telling is the position of the gear lever which should be on the left side of the floor for a 5th or 6th series car. This is therefore a strange set of evidence! I'd like to know more.
Paul