I went to the on-line, brought up the page, printed it off and took it to the local store. Dropped it on the counter and said, "If it's in stock, I'll take it home, if not, put it on order" There is not much they can say at that point, except, "let me see where the closest one is". They can see it's from the NAPA catalog, and the correct number is there "SER 2445". If you try to use the "KD2445" or "OTC2445", they will say,"Can't find it" and they are right - ya gotta use "SER 2445", because that is what it is found as in the NAPA computers.