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The changes in fork occur as follows.. Using VIN for reference.

Adventurer VIN up to 43509 Kayaba forks
VIN after 43510 Showa forks

Thunderbird VIN up to 43509 Kayaba forks
VIN between 43510 and 92893 Showa forks
VIN after 92894 Kayaba forks

Legend VIN up to 92893 Showa forks
VIN after 92894 Kayaba forks

From the above you can see two changes in the fork supplier. E.g. The forks started out as Kayaba, changed to Showa and then reverted back to Kayaba.
I've been wrestling with restoring a pair of these Showa forks recently. There are a lot of similar forks out there, but identifying which ones are similar enough is tough. I have another bike with Showa forks and they sport a tag identifying the fork. It's on the inside of the leg, just below the fender bracket. (I've attached a really crappy photo.) If anyone else has a bike serial number between 43510 and 92893, could you check to see if these tags are present, and if so, what they say? Maybe we can dig up more information on our forks that way.
 

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Good luck in your quest.

I have three sets of Showa forks for my legend. Pure luck that they were all showa. I have stripped all three pairs of legs and all have identical internals.

None of these fork legs have labels. The forks on my bike, from nearly new, have no labels as well.

(right leg showa)
 

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