As a point of interest, I think those are for early 8BA's; the later ones (which I prefer), have 4 individual holes and come rubber coated from the factory. I prefer the later ones, as they have the wires better separated than the ones shown. I pick them up wherever I can (swap meets, etc.) but the rubber coating is usually in bad shape. I take it all off, blast 'em, paint 'em, and then dip the business ends in that stuff you use to dip tool handles in. It takes some practice but they can come out looking real nice.
Here are the two types of wire looms. I found this picture that Pete had posted on an earlier thread. Late on the left, early on the right. (Scott, if you own a '52, I think you want the "4-holers".)