No, sorry... I haven't been in the car audio business for 12 years. They aren't difficult to build though. Get some 1/4" MDF and draw a pattern off the stock housing and cut. It's best to use some Dynamat or equivalent to seal off the gaps after you mount the panel. I used to make a fiberglass enclosure back in the day but it sounds pretty good just going the easy way with Dynamat.
I sure miss those Supras.. I had 4 Turbo MKIV's back in the days when they were top dogs on the street.