Gen 2's have 9500 HID low beams and 9005 halogen high beams, which I beleive is what the Gen 1 HID cars had also. The 9006's have a slightly larger base diameter that fits the hole left by the 9500 bulbs better.
If you're upgrading earlier cars with 9005 halogen high beams, then yes, use a 9005 HID kit.