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Default Fried alternator

Anyone know what I would need to replace (parts-wise) to salvage my '89
mercury 3.0 I/O alternator after reversing the leads and frying it
(literally - white smoke was billowing out of it)? I would assume that
it would be the regulator, at a minumum, but don't know if there are
capacitors, diodes, heat sinks, etc. that would have been fried. The
breaker never tripped, so I'm afaid there's no quick-fix. I'd rather
order the parts and have a shop install them rather than have to
purchase a brand new marine alternator all together. Any thoughts,
ideas, things to look for, etc., would be GREATLY appreciated as I want
to be up and running again for spring! Thanks!