Which Exhaust Manifolds?

In the hot rod magazine swap they used '05 Jeep Grand Cherokee manifolds PN 53013605AB left and 53013606AB right. The article says the lefthand manifold's structural ribbing must be ground for clearance.
The article can be found here: http://www.hotrod.com/howto/hrdp_0706_hemi_swap/index.html

I'm using TTI headers. There's not much clearance in many places, but they fit.