Wheel interchangability question

[Ricter]

I've got a 1969 Pontiac firebird, and I'm wondering how modern of Firebird wheels will still fit my car. More specifically, what I want it a set of 16x8 GTA wheels (the black mesh with polished lip wheels) I searched google but couldn't find bolt pattern/offset specs for those wheels. Does anyone know for sure if they'll fit a first gen? If I'm not mistaken the front and rear of the GTA wheels are different backspacing. These came on mid to late 80's GTAs.

Thanks.