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For large-ish holes, you can make a nice grommet using rubber (or silicone) tubing. Just cut a slit in it, and press it onto the edge of the hole, and butt the ends of the tube together. For a hole that's not round and esp. if there are any convex radii involved, you may have to use some adhesive to hold it in place. Simple rubber cement will do, and the bond won't be permanent. Silicone caulking also works.
The brake line hole grommet, as I recall, was a regular grommet, available at any hardware store for pennies.
Rubber/vinyl covered tube/pipe holders that are meant to be screwed/bolted into place are also generally available from most hardware stores. I have a boxful of various sizes at home. You can secure them with a self-tapping screw in a blind hole. I've also seen some mounts at electrical shops for securing things with zip-ties to a flat panel. These can be glued into place, or secured using double-stick foam tape (which works remarkably well).
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