Ok..just remember you asked.
The Eaton superchargers first appeared (TMK) in 92 on the 3.8L V6, a variation of the Eaton charger has been used up through 08 on the GTP.
Here'* the basic breakdown in regards to Bonnevilles though.
92-93 Series 1 L67, M62 Gen II
94-95 Series 1 L67, M62 Gen III
96-03 Series II L67, M90 Gen III
Series i and II designates GM'* motor at the time since they kept the same motor code of L67 for the supercharged motor, even though there was a large change in that motor as of 96.
The L32 or Series III motor didn't appear in a Bonneville, it was only found in the Grand Prix starting in 04. This motor had the updated supercharger known as the M90 Gen V.
Supercharger info... the M62 and M90 denotes the amount of air in cuibic inches per revolution that the blower moves. The M62 pushes 62ci of air per rev and the M90 pushes 90ci per rev. As the generation of charger increased, so did efficiency which led to most of the GM change in power from the L67 wearing an M90 Gen III at 240hp to the L32 wearing an M90 Gen V at 260hp.
I could never put my hand on the Gen 3 M90 after a spirited drive, yet the Gen V is not a problem.