I bought this FZ2100 with 1200 hours for a decent price (at least for my area). Problem is there is no part # on the deck like there usually is and I can not find an option for the F2100, FZ2100, or the F2400 for a rear discharge deck. Is it normal for the rear discharge deck to have the dual blade setup? Was surprised to look underneath and find 6 blades LOL.