Thanks for posting. Very interesting for me.
Their last "race" together may well have been 1990 at the Australian F1 GP in Adelaide. They were supposed to be parade laps... but, let us say, they wanted to make a good display for the public. Fangio had an unfortunate "off" in the Mercedes but more due to the terrible state of the tyres than any problem with his driving.
I had the pleasure and the honour to be with them on the occasion.