I recieved his reply last night. Thanks for the idea Camaro.
So, I checked out his store and none of the products specifically mention our platform, but I think that someone just has to order one and he will take care of making sure that we get the proper throttle body.
I'm a big believer in 'more air is better' so I'll be grabbing one for the wifey's 4.2l and my 5.3l. I'm probably two months away from ordering due to an x-mas related lack of funds.

Even though I could save the $65 by sending in my old TB I won't, just in case the new one fitz's I'm not left stranded for days without my Daily Driver.
I hope this info helps somebody. I'm jazzed that we have a new source for ported throttle bodies! To me that's an even better mod than the supersparkz!
EDIT: Just to clarify. I am not personally vouching for Supermodulation or his work. However he seems to be well respected on 355nation.com and that's good enough for me. I will have no issues with dropping $600 on two throttle bodies from this vendor. Take that for what you will. YMMV