These kind of gearboxes were used in Maserati Sebring and Mistral but also in 4.2 liter 8 cylinders like Ghibli, Mexico, Indy and QP1/Quattroporte 1.
And further in the Lamborghini 350 GT.
I have nearly the complete gearbox, only missing the input shaft (where the clutch disk slides over), 2nd gear on the main shaft (but I have an EXTRA gear, only different type of synchronizer) and the gear on the main axle for the tachometer drive.
I also have a set of 4 EXTRA gears and sleeves, these have a different type of synchronisers (ridges on the gear instead of ridges in the synchronizers).
Except the pressed gear of the 4th on the lay shaft, all other parts are in GOOD and USABLE condition.
You can check it yourself in the pictures below or check my homepage - details above.
I priced most of the parts separately, so you can choose whatever you need. The pricing is on my home-page.