Early and mid year Firewall harness clip

Trying to get information on the harness (loom) support that clip onto the firewall lip as shown.
'68 was the last year they were used at that location. 1969 uses a retainer that is held in place with a screw into the cowl.
For the moment I'm assuming the one matthon posted is correct and the one I found was originally for something else.
This is an unrestored '68 GTS.

Mitch's68GTS383-engine-006m.jpg