Plastic loop, LH frame, under z-bar pivot

[R/T's 4 R/P]

As I was disassembling the car I noticed that under the ball-pivot for the z-bar, on the top surface of the frame rail, was a single hole and what remained of a white plastic loop.
What would that have been for?
I've had early production cars and this is not there.
The car has a SPD of 4/5/70.

The only thing I can think of was to hold the speedometer cable?

[anlauto]

Speedo cable

[moreparts]

Speedo cable

I've seen them black, but not white.   

[Banana]

Wow. Another little factory detail I just learned about from this site.

Can someone please send a pic of the black plastic loop? Source?

Thanks

[moreparts]

Here's mine.

[anlauto]

Looks like someone used the heater hose one down there

[moreparts]

Looks like someone used the heater hose one down there

That is what was on my car when I bought it in '91.  I've also seen that used by MoPaR in that same location across other lines in my junkyard expeditions. 

[Banana]

Thanks very much moreparts

Alan, what style loop have you seen/use?

Thanks

[anlauto]

The white strap, same used for the wire harness