Notched Threaded Firewall Grommets
If you’re looking to have everything in your engine bay as top-notch as the rest of your ride, having beautiful firewall rings might be just what you need. With a threaded back and ABS nut you can unsure and nice tight fit on almost any fire wall thickness.
These Rings are sized for 5/8" and 1/2” Heater Hoses and 8# and #6 AC Hoses. Cutting one of those hoses in the ring and feeding wires is a option to use these as wire ways.