Hey guys, I'm about to replace the starter on my 2004 Chevy Impala Police Vehicle but it's my understanding the 3800 Series uses two different starters depending on the model trim? At least this is what the person at Advanced Auto Parts said. I just decided to save considerable money and order from Rock Auto but I want to be sure I order the right one. Each picture under the 3.8 looks just like my starter so I don't know what the difference would be. Some say permanent Magnet Gear or Permanent Magnet reduction, while some say nothing at all if that matters. Also at the auto parts store the asked me what the 8th character in my vin was which is "K" if that is of consequence. Thanks in advance for helping me learn the difference.