Split this request from the earlier "upper" PS hose strap discussion.
Yes it seems these are not often seen and at this point I'm unsure of when they were used/installed and if this is a San Jose or all plant detail. Would guess this is a 67 C or A code thing (for right now) and all that may remain is the mounting hole in the lower shock tower. Think that may be the clue we need to look for (unless the strap is present as in the picture I posted) on the examples we compare.
Will be a little while until I can go through all my pictures (other commitments)
To start it off the picture above came from the 67 San Jose convertible featured in one of the unrestored picture threads in that section of the site - 7R03C1883xx (projected build date of about March 2nd)