Took me a while to find them. They may not be aluminum, I may have gotten that incorrect. However, they are metal, and very simply constructed:
Fuel Savers
I remember reading about the evo's VGs, that they worked when as tall as the boundary layer and angled 15 degrees off from the direction of airflow, or something like that. If I recall correctly from the comparison I read (I've read too many pages over the past couple of weeks to remember where I saw it), the metal "fuelsavers" are inferior to the airtabs in their actual effectiveness... But still, both the "fuelsavers" and the mitsubishi VGs are a simple enough shape. It wouldn't hurt for me to mock up some cheap ones and tape them to my roof to see if I can manage to make something that does anything at all.
However, I will not even bother with this until I get my 'Guino installed and calibrated.
Yeah, they do have a rather steep window and short trunk, don't they?
I got the tuft testing videos up on youtube, but for some reason the framerate when uploaded is abysmal. Coupled with the bad image quality I don't even want to link them.