Land Rover Santana 6 cylinders

If anyone can help me, I would be grateful.
I have a 1980 Land Rover Santana 110, a 6-cylinder gasoline engine.
I'm in Peru. I'm rebuilding the engine and I've run into the problem that I can't find pistons, not to mention other parts.
If anyone knows where I can find these and other spare parts for this model, and in what country, I would be very grateful.
Thanks,