I thought I'd treat my ignition system to something nice, so I purchased a Magnecor spark plug wire set. When I first looked into them, their catalog doesn't list an off the shelf set for the slant 6. If you look it up, it says "refer" next to 74-60 Plymouth. I contacted Magnecor and had a great experience with the lady who took my call. I ended up sending her pictures of my wires plus measurements for alll wires. I chose the Electrosports-70 7mm cables as this is not a race engine. Magnecor then made up a custom set for me that look OE (including the wide spark plug end that covers the spark plug tubes) and are numbered at the distributor end. The custom set is only offered in Black which was fine for my needs. Anyways, I thought I'd share this as others may want something similar for their slant six ignition system. The new set fits perfect and I'm extremely happy with the entire process through Magnecor.