32mm Marzochhi Forks

[baldeagle]

Hi all. I have a Triumph trials bike that has 32mm Marzocchi forks fitted. They are 850mm long when fully extended, which looks longer than the forks suggested as fitted to some of the smaller Ducatis.
I am trying to find what they are to enable me to put the correct grade and amount of oil in.
The yokes look exactly the same as the ones fitted to the 35mm forks that seem to be fitted to many pre 74 scramblers.
Any help greatly appreciated.