The part number Silverbullet posted is the same one the I received when I purchased the new aluminum lower gaskets. The number you have posted is the original part number for it. By looking at them, I could see no difference between them.
You'll need the UIM gasket, as you'll have to remove that to get at two bolts that are under it for the LIM. While things are apart, may as well pull the TB and give it a good scrubbing, along with cleaning the MAF and IAC. So, get that gasket also. It'* a lot easier to replace the valve cover gaskets while it'* torn down, so you may as well do those. Pick up some injector O-rings, too.
Black 2000 SSEi, Silverstar Headlights, Angel Eyes fogs, 3rd brake light overlay, hi-flo cat, drilled 180 degree thermostat, Intense FWI, PCM, shift kit, and 3.4 Pulley. Solid front mount.