bolt up the rear mani, then remove the crossover and press it onto the front mani, attempt to bolt up the front mani/crossover.
You'll probably need to trim the rear of it because the angle is wrong.
It seems you can still get enough in there to have it seal though.
Agreed on the primary locations. Just pulled mine off and I'm not so pleased with where the carbon deposits are resting.
I'd love me some ZZP's, but those are some serious money.