The M90 Gen 3 was found on GM cars from 97-08. The only cars to get a Gen V M90 ws the Grand Prix from 04-08. All other cars got the Gen 3 M90.
Best ways to tell the Gen 3 from the Gen V is the
Gen 3 has a painted snout the Gen V does not.
Gen 3 has a bolt boss in the top center of it to hold the fuel rail, Gen V does not
Gen 3 has a 3 bolt setup for the TB, Gen V is a 4 bolt setup.
Gen 3 snout is longer than a Gen V
Now..on the Gen 3 there were changes made to it, but the generation was never changed.
96 the charger body was painted, later years it was not
96-97 there was a vacuum tree near the throttle body on the charger. 98+ there was no tree.
00 Regal GS: All kinds of cool stuff.