I have a hilux 4x4. Caster/camber kits are installed however we have no adjustment on the left. Type installed have allen key adjustment on the bottom. I am looking for diagrams so that we can check whether properly installed and no parts missing. As kits were in place when vehicle purchased
Can't address your specific request, but I can suggest that only two things result in the need for aftermarket adjustment kits. Bent parts or incorrect ride height are those two culprits. With the age of your vehicle, suspect a ride height problem due to weak springs.
The big issue with ride height is there will still be tire wear problems even when camber is set to specs. The tires will only be at the correct setting on the hoist. The control arms will travel through the wrong arcs as the vehicle bounces up and down as it travels down the road. This can really be seen easily on the down-sized Ford Bronco and Ranger with twin I-beam front suspension. As the springs weaken and the front end drops, the tires tip in severely. Nothing will reduce the tire wear except new springs.
Every manufacturer publishes ride height specifications and points to take the measurements. Vehicles that use torsion bars can be adjusted to bring the front end up.
As for the kits on your vehicle, you might have better luck looking for similar products at the parts stores to see what they show. Every kit includes instructions and diagrams. If that doesn't help, look for an alignment specialty shop. They will have these items in stock and might give you the installation instructions from one of them.