I ordered the 10 point cage yesterday for the racer. It's coming from a "one man" shop in the hills of central PA that specializes in custom auto frames and cages. He spent about an 30 minutes in my SVX with his meauring jigs and also got the measurements he'll need if someone wants an 8, 6 or 4 point cage and still wants to keep their interior.
We should be picking up the pieces in a week or so, I'll keep this updated with pics and fitment. But everything we've heard about this guy is that It should be just right.