Direct fit applications for 3.8L, on a 3.4L one mounting ear will not line up, most people just do not use that mounting ear and allow the other two to hold it in place.
Plug and play with a 14.8v set point.
FIts 99-04 Pontiac Grand Prix, Chevrolet Monte Carlo, Impala, Buick Regal. Also fits buick rendezvous, pontiac aztek, and montana with 3.4-3.5L engines and the 4 Pin plug.