Bill, not sure your point, not all tags are present or can be counted on to be correct. It's so easy to look, just look. And LS/posi, same thing, nobody really cares.

Now what I am curious about that you might have insight on is the O-ring thing. I've seen more O-rings in the C-clip groove then I'd suspect were installed during repairs and more in later vehicles. Is that something Ford ever did from the factory?