"Early lines" include a fuel line running down the tunnel too (just in case you didn't already know).
I have a restored San Jose example, if that helps...the assembly location likely only affected what day of the year that the early/late running change occurred (if this is of any help).
There are two (or 3?) spring steel type clamps used on these factory disc brake cars, one in the trans tunnel near where fuel line splits away from the brake line and at least one more by the steering column area (not seen in my pictures).
Perhaps Jeff has a few shots of those...I recall there were threads discussing them and pictures were provided.