Which Internally Regulated Alternator Should I Get?

[NorCalC20LWB]

Hey all, I know this is a question that has been discussed many times, but I'm having a hard time figuring out exactly which alternator to get to convert to internally regulated. I just got an AAW Classic Update wiring harness and need to get an alternator to with it, which must be internally regulated. I won't be running electric fans, big amps, etc. so don't think I need any massive amp output. Can somebody give me a part number to search for? So far all I've been able to figure out is 10 or 12SI. I'm sure this is listed somewhere in the search function, but filtering through all the posts has left me a bit confused.