j-d, the Snap-On part number for the socket S9719KA. It doesn't look like the one in your photo but I might be wrong. Yes it's expensive, but it solves two problems. The first is cross threading, because you use the socket to start the plug and you can feel it. The second problem is if you get unlucky, and the shorty socket gets jammed in the head, that 70 bucks is nothing compared to the nightmare of trying to get that socket out. The Snap-On guy said it was developed with the V10 in mind, but can be used for others also. Good luck with whatever you do but if you get that socket your gonna love it. Makes the job just a bit more safe and easy, but the whole thing is not an easy job.