if you are referring to button panels the store page shows the difference between 4 spoke steering wheel being early model and 3 spoke steering wheel as late model. in terms of the SS models it would be a split at 2008 with the 05-07 being early and the 08-10 being the late model.
Early vs late is goi g to vary by the vehicle system being described. For button panels it's based on the donor steering wheel, but for the brake booster and master cylinder it's based on the approximate physical size of the MC and whether or not an aluminum spacer is present between the MC and the booster.
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