I won't speak as to what ir original for the chev CMP, but common practice for brake lines (and fuel lines) is that they are clamped along the frame rails so there is no vibration of the line. There should be no need for grommets of any kind on the holes through the crossmembers, as a properly clamped tube should not be moving. It should be bent so it is not touching the edge of the hole of the crossmember.
Princess auto sells the wiring clamps with the rubber cushioning in them. In the military supply system they are called clamp loops, and come in a large variety of mounting hole sizes as well as the clamp size. They will be on sale starting on the 4th of March at Princess. They are prefect for securing the brake lines.
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