Have a lower intake leak on my 2003 Bonneville SSEi. What parts do I need to do this myself? Dealer wants $750. I'm guessing supercharger gasket w/coolant o-rings, coolant elbows, and LIM gaskets. Anything else? Doing a search some have mentioned a throttle body gasket as well. Is that needed?

the gaskets are cheap and a good idea to replace while you have it apart. you want to look for the felpro aluminum frame gaskets, they dont go bad and blow out like the plastic ones

TB gasket not needed UNLESS you remove the TB from the supercharger. Which you don't have to do. But, considering the age of the car, I suggest removing the TB and spraying the snot out of it with CARB cleaner. Gaskets just a couple bucks anyway.

But yea, your shopping list looks about right except for a gallon of coolant, and your fav oil change kit. Gotta do it, you probably have coolant in the oil.