Colnago d shaped fork

[markyboy]

Does anyone know how long the threaded bar is in the fork steerer of the d shaped fork as i am on the look out for one.
I have saw a used one which has a steerer lenght of 21cm but would need to cut it about an inch and not sure if the thread left in the steerer would be long enough,
unless it travels all the way up.

[ms6073]

From the geo charts, seems like Colnago only made 3-4 forks for the variety of C64 frame sizes, so I think the answer depends on what size frame the fork was originally supplied with and probably the year of manufacture as well as I do not think a 2018/19 forks have the same design as 20/21/22 forks.