Inspection of a 904 torqueflite

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This was done by hot rod magazine.....he’s upgrading to the 5 drum clutch and went with longer forward clutch splines-


You can see in the picture that one is slightly longer than the other.

However......my 904 and 999 have the same height on these
1.30 on both
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1.30 on both of these -


So why are they the same. The 904 has 4 clutch drums
The 999 has 5/4

The direct drum should slide into this piece. Either I have both long ones or both short ones. Since this was gone through. Maybe they replaced it with the wrong one or could it have come like that from the factory. Maybe it doesn’t matter. I don’t know.

I guess this is where the learning process comes in

What should he measurements of these splines be?