Any well-established and reputable alternator/motor rebuilding shop should be able to rebuild your alternator. That is the way to go ... unless you are familiar with replacing bearings, and testing and replacing diodes, etc. in other alternators.
Bosch never made an internally-regulated alternator for a 911! The 1982 - 1989 IR model alternators were mfr by Paris-Rhone and Valeo ... and have the worst reliabilty record of any electrical part ever put on a '64 - '89 911!
The 1975 - 1981 980 Watt Motorola/Marchal/SEV is the best alternator fitted to 911 models, but machining or replacement of your fan housing/mount would be required to install.
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Warren Hall, Jr.
1973 911S Targa ... 'Annie'
1968 340S Barracuda ... 'Rolling Thunder'
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