Different length, namely a short or long, but there is one that is in between not so often used.
The face of the bearing can be different as seen, so this need to be matched up to the one that came with the kit/diaphragm.
The wrong length, typically too short, seems to be the culprit. Length also depends on the pressure plate used as the widely used diaphragms may raised or flat fingers, then there is the Long 3 finger style, and the Borg&Beck 3 finger style.
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