I had the exact same problem... first
oil change on my KCR 427W, I e-mailed Keith & he recommended the FL-1A- which, of course, I found out was too short. Ended up going to NAPA & buying some of their house brand filters... seems like he said it was for a Chrysler or something... will be good the have the Motorcraft part number should I decide to switch. I'll probably stick with the shorty, as I don't want to run more hoses & clutter up the engine compartment. I change the
oil about every thousand miles or so anyway.