Ok, I think I have the eyebolt locations figured out at last. My next question is how to attach the leg strap mounts for the 6 pt. The instructions from Schroth indicate they can be mounted to the same anchor points as the lap belts, but do they have to be fitted with the snap hooks also or can the existing brackets be mounted ‘flat’ to the floor?
Not completely relevent, but here is a site showing an install on a pseudo-track E30:
http://e30m3performance.com/installs/installs-3/harness/harness2.htm
He made seperate mount points for the sub belt.