I do have the rear bumpers, they came with it but will need rechroming as there is some rust on them. I will fit them, mainly as any bump to the rear would be pretty drastic without them.
The first cars were an all aluminium body built on the Fulvia Coupe steel floorpan. The next batch which were also Series 1 had steel bodies with alloy bonnet and doors, with the side opening bonnet and a hatch on the back to access the spare wheen. All the series 1 cars had a four speed gearbox.
The series 2 moved to an all steel construction and a five speed box. However, the first series 2 cars were built with the series 1 body so have the five speed box but alloy panels - I really wanted one of these series 1.5 cars but there were only 600 built and the two that have been for sale recently were beyond my budget, particularly as one of them was in Southern Italy so transport would have been pricey. I almost bought an early all alloy one from California but the seller messed me around a bit and I lost trust in him - it was a big commitment to buy a car from a private seller completely unseen so I passed on that one.
There is a great video on Jay Leno's Garage YouTube about the Zagato -
https://www.youtube.com/watch?v=mFKxEcQ3r7k - but it isn't all factually correct, particularly the power quoted!