I posted this same question in Drivetrain, got zero replies so I figured I'd try here. GMpartsdirect shows 2 different p/ns for LT1 clutch discs, 12551309 ($198) and 10207027 ($205). 12551309 is the same p/n that is shown in the Camaro parts manual. Anyone know what 10207027 is?

 

12551309 is the clutch disk, and 10207027 is the pressure plate.

In the parts manual, they're referred to as:
12551309 - PLATE, CLU DRVN
10207027 - PLATE, CLU PRESS (W/CVR)

 

Thanks