Woodman;
I believe that is a failure of the classic quick and dirty alternator conversion where the housing was unceremonially modified (by weakening it, as you can see) so that it is not necessary to install an adapter...one option is to locate an unmolested housing from a junk alt with which to repair that alt. then reinstall with an appropriate bracket (IPD for Bosch SW-EM for Delco)...as far as absence of Regulator, other poster has already touched on the possible answer: internal regulator ...if you post some pictures of the rear contact area, forum should be able to help further identifying the alt.
I also request permission to republish your pic to show what a bad idea the quick and dirty non-bracket mounting method is.
Cheers from Connecticut!
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