It looks like the latest gear.
Details on what to look for here....
As Mike said,it is an upgraded gear and shaft. You can see the alignment triangles.The Old type were rough cast without alignment marks.
Thanks guys! I just needed to be sure.
You need to drill out the rivets to separate the parts.
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You'd probably need to source some solid steel cold forming rivets and get your best ball-pein hammer out. There doesn't appear to be enough room for a nut and bolt, even a huckbolt.
This is what you find in taking it apart.
I found it easier to drill out the domed head inside the clutch basket, to remove that. Hydraulic press to separate the two gear sets, careful not to lose the lock dowel.
Drill the rivet remains out of the spring support plate and discard. Make a note what springs are where, three types , opposite each other radially .put a marker on the position of everything , although the lock dowel can only engage in the set position.
I am sure I can find a better way of putting it back together, without hammers and steel cold formed rivets.
where there is a will, there s a way.
I managed to catch it in time but the torsional twist on the splined shaft was clearly evident.
I had removed the cover just as in your photo and seen the smooth z25 gear and the alignment marks so assumed all was ok. Also checked wth the main dealer who confrmed upgrade completed.
Having the upgrade without checking the alternator end bolt and belville washer on a regular basis is a recipe for disaster as well as shearing the splines on the alternator .
Speaking from experience.