I purchased underdrive pulleys for my 05 gt..this is my first dealings with the mod motors so I apologize for my ignorance beforehand. My question is are the underdrive crank pulley/balancers the same for the 05 and the 96-04? The reason I ask is the invoice has 96-04 on it so I want to be sure I have the right part before installing it ..Any info on this would be greatly appreciated ...thanks