1972 CB450 Fork Springs

[Habanero52]

I want to order a set of HYPERPRO Progressively Wound Forks for my '72 and a set of Y.S.S. PD Fork Valves.
I have not yet taken apart the forks and before I do, I would like to see if I can get a base line of the following dimensions:

• Fork Tube ID
• The OEM Spring Length
• The OEM Spring Rate.

Perhaps someone has the dimensions and is willing to share them with me or point me in the right direction.
???