Its an 8mm socket-head M10 at the top of the alternator, and 13mm hex M8 at the bottom.
I'm surprised the car started with a locked up alternator. We had that on Mike's Murple and the starter wouldn't even turn the engine. Its not fun changing the alternator with everything together but it is possible.
When buying a replacement watch out for people selling the V6 alternator as the V8 one (even down to V6 alternators with V8 rear covers on so the part number appears correct). It appears to be the same in every regard apart from the angle of the cooling duct which points sideways on the V8 and down on the V6. Mounting holes for the duct are part of the rectifier pack so it can't be rotated.
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