Land Rover Santana 6 cylinders

If someone can help me, I would be grateful,
I have a Land Rover Santana 110 of the year 80 6 -cylinder gas.
I am in Peru. I am repairing the engine and I find the surprise that I can't find pistons for the engine, love other attachments.
If anyone knows where I can find these and other spare parts for this model and in which country, I would be appreciated very much.
Greetings,