Based on my experience with ZZP'* gaskets, I'd recommend not buying this from them. The gaskets appear to be OEM like, yet they don't fit and may cause leaks.
Another thing I have come across is they keep their costs low by providing only what you see in the picture. In their picture the UIM, gasket, map cap and pcv tube are the only things seen. If you were to say order this from Rockauto or a local parts store it would include the UIM, gasket, map cap, pcv, pcv tube, injector o-rings, the plastic tube for the back of the manifold, all o-rings for pcv and two size stove pipes which fit either the newer design or old design of the LIM.
If you buy the metal LIM'* from a dealer or Intense Racing, you are getting a GM OEM gasket that fits perfectly.
BTW don't forget the Dorman 47065 set of coolant elbows that you will want to have/replace.
00 Regal GS: All kinds of cool stuff.