Delco 12SI. They work awesome...at minumum they are 78 amps, and they charge very well at idle. Very cheap. You can get chrome or powdercoated cases anywhere. Even better is they have an internal regulator, and anyone can take it apart. I switched from a reman 78 amp mopar alternator to the one seen here (78 amp 12SI for a 1985 305 Firebird) for $75 total, and my lights no longer dim at idle, volt gauge never moves. I even used the same v-belt.