Parts are still available.
You can find the web site of Diesel engines manufacturer on: www.dsas.sk despite they are producing just a limit numbers of Diesel engines per year, they became an important supply of pipes to
ZETOR CZ
Fragokov is also still working /clutch, brake cylinders/
ZVL ZKL are still doing bearings
Rear transmission parts still are made in Poland by KORURS
Gearbox producer POVAZSKE STROJARNE is brankrupted, but not OEM parts still available on market
Front axle manufacturer VLKANOVSKE STROJARNE also bankrupted, but you can find not original parts, yet
Others main parts as belts, water pumps,
hydraulic pumps, gears, cylinders, seals, glasses, valves, rings, lights, labels, etc. still available and can be supplied by me
Last big ZTS contract to KAZACHSTAN, about 50 tractors type 18345 in early the 2000, resulting a blash because of technical problems with shafts on gearbox