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Help with fork lowers identification please

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Nashfly:
Hi,

I have a completed project based on a US import CB500 Four (1972)

The fork lowers are slightly longer than standard - top to bottom 357mm (just over14 inches)

There's no markings on them, they are 35mm and work just fine

Can anyone throw some light on what the part numbers are or what model they are from?

Alternatively, can some let me know the length of a standard 1972 CB500 Four fork lowers.

Thanks in advance for any assistance

Pics below

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deltarider:
I bet there's a three digit number on the inner side. 341?

3scs:
Like this

Nashfly:

--- Quote from: deltarider on December 02, 2025, 11:48:03 AM ---I bet there's a three digit number on the inner side. 341?

--- End quote ---

Thanks for the reply, but I have checked both lowers and there are no markings

Nashfly:

--- Quote from: 3scs on December 02, 2025, 12:17:30 PM ---Like this

--- End quote ---

Thanks, as above there are no markings, is the one in the picture measuable? If so, could you please let me know?

By way of explanation,  I'm looking to upgrade the front brake, probably to an AP Lockheed set up, which will require a bit of machining to the fork lowers

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