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Actually, the X66 is the base model SS396 so it probably shouldn't have the louvers since they were part of the Z21 trim group. They might be part of the SS package though, I couldn't tell for sure over at CRG.
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Jeff, visit
camaros.org: Model ID and Numbers decoding - Camaro FAQ and search for the table entitled "
Body Trim and Paint Features of the 1969 X Codes". SS396 X66 w/out Z21 or Z22 is shown as having black body sill, blacked-out tailpan, and rear quarter louvers; and not having driprail and wheel opening moldings.