What is this clip for?

[toms68cst]

I'm assembling my motor and I have two of these clips on hand.

There are two other similar clips that I have that are for the front spark plug wires. They have some thick black insulation on them.

I think these two clips were on oil pan cover bolts too. The only other thing I can think of that might run down there was the positive battery cable that runs to the starter on the right side of the motor. The wierd thing is the mounting holes for these mystery clips are larger like they should go on one of the larger corner bolts of the oil pan cover.

Does anyone recognize this clip?

Thanks, Tom