CCMoe this X series 60 Mid Mount Blade more then Likely would fit On and of 4x5 Models with 26X12 rears The frames are Not that different Between the 4X5 Models Mounting Holes Might be a Little different But the 40 Loader for the 4x5 will fit On the X400 thru X749 Models I Looked at Buying a X465 at One time the 45 Loader sub frame Interfered with cooling of the Air cooled Kawasaki supposedly was the reason I got But Deere Corporate Told me the 40 Loader would fit the X465. I had a 40 Loader at the time on a 425. But I ended Up Buying a X485 with a 45 loader Just for the greater Max capacity at Max lift height(didn't think or know about shimming the Valve at the time) Had just joined Tractor forums of any Kind In December 2002( Garden web Lawn & Garden tractor forum). I was looking at the X465 summer 2002 after I retired from the Army.
They Only reason the Mid Mount Blade was dropped after 2012 was the Lack of sales. Deere Offered a Mid Mount Blade either Under the Deere Name or aftermarket Until 1982 Many of the aftermarket Manufacturers that made mid mount Blades that Deere sold through the dealers had merged, Went away, or stopped Manufacturing Garden tractor attachments by the mid 1980's Wheel horse continued the Mid Mount Blade through the 1990's and early 2000's a few other Like Gravely and Ariens still offered a Mid Mount Blade Until the 1990's But again they just were Not Big sellers The rear Blades and Box scrapes really took over the Grading jobs the Mid Mount Blade could do and they were far faster to mount