Even if you knew the fins that were refurb'd by the time you were going to take this flight, you'll only be able to find out on the date of departure what fin you'll probably actually be on. Heck, fin #'s aside, even the designated metal type can change on the day of, or even a couple of days in advance... there have been a zillion times where I book to sit on a 320 but it ends up being a 319, or a 321 becomes 320, or a 763 becomes a 762, etc...