I bought some of these necks recently. Good price and they fit! Fast delivery. I also went to NAPA and bought a cap from there. P/N 703-1220. It had a flat spot right in the center. No knurl. Probably will return and have them pull another from the shelf. When I was working for NAPA I know they were always supply and demand minded as sometimes we would find Bosch brand items mixed in with their ignition line. So maybe the same part number cap may have a different part in the box.