There are three more pictures some pages further in Alleggerita, of which two do show the TZ2, and one shows only the GTAs. I cannot quote pages reference, as pages are not numbered in that book.
On the other pics, the TZ2 can be seen from behind and right side. There's no hole it the right C-pillar neither, confirming it as a new car. There seems to be no registration plate, and the fourth pic is captioned "early 1966".
Adriaenssens caption quoting the car as 106 relies on the reg plate fitted to the bonnet (UD111832), but as I wrote yesterday, that's exactly where he is wrong: the bonnet doesn't belong, originally, to that car, and has clearly the Monza 66 features (recesssed fog lamps fairing were first seen at Monza on April 25th, not TF as I wrote yesterday) , thus the pictures have been taken at soonest in May 1966, but also possibly quite later.
If we consider the featured TZ2 as new (i.e; noot yet raced at the time), the possibilities are:
750117, but it is not her, as the picture shows "normally" located door handles, where 117 has them higher than standard on the door.
750115 has a certificate of origin dated 29/3/66 and no regisration known. It can fit. But 115 has also pretty high door handles, albeit not so much as 117, and the car here has a rear view mirror where 115 has not, at least in current form.
750116 could be a candidate, but it has received UD121003 on March 11 1966, so ity's strange the car seems not to be registered in May pictures. But since it had not raced at Sebring, Monza nor TF, the lack of C-pillar holes is plausible.
An unsolved question I have been trying myself at a few years ago without success...