I would like to put in a plug for Casco.   I was having a problem keeping my battery charged, so I decided to upgrade my 55 Tbird to an alternator.   No one seems to work on generators anymore and I am running an electric fan.  The generator is a problem with modern electronics and 2018 traffic.  I ordered one of their alternator kits and installed it on Monday.  Their instructions were excellent.   The alternator came tested and the brackets fit perfectly.  The kit allowed me to retain the voltage regulator and wiring.  It's not needed but it looks stock.  Even the GEN light works.  This is a true bolt on.  The kit is a little pricey, but well worth it.  It's rare that an aftermarket part fits and works that well.