Metal wire harness clip, firewall and maybe other locations

Looking for one clip.
On '67 and '68 A-bodies it clips to the cowl-firewall pinchweld and supports the wire loom in a coated loop that snaps closed.
Probably the same clip as the four used across the back of the engine bay on earlier cars.
May also have been used in other locations such as under dash or to support A/C wiring, or vac lines.
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