George, What I do with them is use extrude plastic loom. It’s 5/8 or 3/4 inch. I don’t remember. I just put it over it. It looks really good especially if you hit the stuff with tire shine before putting it on.
I gave up on trying to get that thing It wasn’t sold separately from the harness.
Start at one end and zip tie that end. Feed it on with the split facing the firewall. When you get to the support mounting tab, carefully cut out an opening with a box cutter. Where leather work gloves when cutting so if you slip, you might not have to go to the ER for stitches. Continue on down the line. Use zip ties.
Keep up the fine work on that puppy.👍
Here is a much better idea. Use 3/4" i.d. flexible electrical conduit, purchased at home center stores. Cut it to length, split it lengthwise, fit it over your wire harness, then secure it to the original push-pin holes using 1" metal cable straps (also at your home center store) and bolts/speed nuts.