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What I know is 603.96/#14 heads/vertical prechambers take injectors with coarse threads in the middle of the holder (middle = between tip and wrench flats). 603.97/#17 and later heads/inclined prechambers take injectors with fine threads at the tip of the holder.
I don't know if a #16 is like a #14 or #17 or something entirely different.
602s from 1990 use the 603.97 style injectors. I mean they're visually identical. I don't know about 601 and 190D 602 injectors.
606 injectors also have fine threads at the tip but otherwise look nothing like a 603 injectors.
Pictures pilfered from FastLane and ***************
Sixto
87 300D
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