I also added the T10 chassis code to those which didn't yet have it

There's also these two
http://www.imcdb.org/vehicle.php?id=897390
http://www.imcdb.org/vehicle.php?id=925114

and this perhaps just the code [T10]
http://www.imcdb.org/vehicle.php?id=316097

A small "mass" change
These should be 1938 110 AF TIBB Machi instead of simply "Trolley-bus". Last time I went with what was 'established' by previous posters but they should get their proper model type I think.
https://imcdb.org/vehicles.php?make=Alfa+Romeo&model=Trolley-bus+TIBB&modelMatch=1&modelInclModel=on

OK
For the one switched to Diesel I wonder if we should still list it as trolley-bus or not
https://imcdb.org/vehicle.php?id=703596

I guess not? Same as a converted convertible that used to be a coupe, 'class' should point to what it is now or to how it came out of the factory first time..?

I'm not sure it was really decided

Hello again

Superfluous info to delete? Alternatively add this to all the rest

California's
www.imcdb.org/vehicle.php?id=245192 -they all are Coupé Cabriolet..
www.imcdb.org/vehicle.php?id=1277307 -they all are 4.3
www.imcdb.org/vehicle.php?id=837229 -they all are [F149] pre-T at least (I suggest we don't need type codes for Ferraris anyway as they all have different model names -even by just a 'T' or a 't' or an 'M' etc so no confusion to whats what like e.g in a Porsche)
www.imcdb.org/vehicle.php?id=666255 -except three cars on special order, they all are DCT (or DTC even..). Certainly put 6-speed manual info in there if we ever find one of those 3...
www.imcdb.org/vehicle.php?id=1008071 -see above
www.imcdb.org/vehicle.php?id=989498 -see above
www.imcdb.org/vehicle.php?id=548353 -no change here, this we can keep!

250 GTE's
Similarly for the 250 GTE, 2+2 not used for this model (even if it is true)
www.imcdb.org/vehicle.php?id=247727
www.imcdb.org/vehicle.php?id=976374
www.imcdb.org/vehicle.php?id=866849