Success!
I found an outfit that had 8 aluminum stacks and I ordered them up.
We were pretty much on the same page as far as 48mm and IDF mounting, so (knocking on wood) all should hopefully work out well.
I've got some cool ideas using my air cleaner baseplate, and foam, to seal the underside of the stacks from debris being blown up from underneath the decklid, and I'm going to add side scoops where my side windows used to be.
I'm going to use Panteradoug's rubber screen mounting trick (if he'll show me), and some screens on the side window scoops ought to have my setup seeing clean air and looking as cool as it gets IMO.
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