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your 911 came with older type alternator with an external regulator.Those had different shaft(smaller) so it was 22 nut size. Later model of alternator with internal regulator has 24 size nut...so your alternator has been changed..that is all..
Ivan
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1985 911 with original 502 191 miles...808 198 km
"The difference between genius and stupidity is that, genius has its limits". Albert Einstein.
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