New LS1 Owners - Newbie Tech - ls6 intake PN:'s

I went to the part number look up thread, but I don't understand why so many say formerly(which ones are right) , and I don't see a part number for the 2004 GTO ls6 intake.

I want to purchase a LS6 intake and I would like to know what I'm buying is right.

Can anyone help.

These are the two that I have: 12561182 and 12573572.

I have,
01-02 f-body-12561184
ZO6- 12573572

anybody else

We use part #88894339 whenever we sell the LS6 intakes.

I guess what I should be asking is what casting numbers are ther to look for on a LS6 intake

LS1 intake manifold, with EGR (98-00 F-body) = 12561269 (formerly 12560688)
LS1 intake manifold, no EGR (from 97-00 Corvette) = 88894095 (formerly 12557846, 12556333)
LS6 intake manifold (01-02 F-body) = 88894339 (formerly 88890524, 88890523, 12561184)
LS6 intake manifold (from Corvette Z06) = ? (formerly 12573572)

Sorry for the old thread bump, but this thread helped me out!!! Thanks!

Is there any difference between LS6 intake manifold (01-02 F-body) = (# 12561184) & LS6 intake manifold (from Corvette Z06) = (# 12573572)?