Well, that sucks! I would call it reworked to fit! If they only knew how hard the 54" blades are to find, at least around here.
I still have the original mount for the GT 18.
I dont know what the true definition of rare is, but apparently the FF doesnt fall into that category. I seem to remember a certain member that was willing to sell a kidney for a $600 fixer upper and a bunch of other members that would do the same thing if they could find one close enough to buy. Now they are common as hell and aint worth squat.