Retro suspension fork steerer length?

thejackal

Retro Guru
Evening all

Am getting closer to completing my retro Kona AA that I purchased from Kase.

I believe it to be a 19" frame. I didn't get the original forks with it and am looking for some RS Quadra/ mag 21's etc, or period correct Marzocchis etc.

They need to be threaded to work with the Velocity stem etc.

How do I know how long a steerer I need and how much of it should be threaded?

Many thanks
 
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