The ZTS website has been down for years, so i have to do this from memory: They had the 90 and 120 type gearboxes. the numbers represented the max Kw they could take. So i dont know if the 90 (122hp) was used in the 12245 or if it was the 120 like the 142 and 162...
But, you'll need to keep the crown-pinion set together anyways...