It's not a question of whether the TG2754 54" blade will fit, it's a question of what sub frame it comes with. According to a pdf version of the 2007 Kubota Wholegoods catalog I have, the
BX23 requires a BX2751 Quick Hitch for it to work with your tractor. Per the below excerpt, quite a few other BX tractors used that sub frame as well, so check what tractor it's coming off of.
"TG2754 54 Snow/Utility Blade Manual Angle:
BX1800,
BX1830,
BX2200,
BX2230,
BX22,
BX23 require BX2751 Quick-Hitch Subframe Kit."
I also checked and that same sub frame is used for the 50 and 60 series BX's. So chances are it will work with your
BX23. Just note that it is manual angle and you have to get off the tractor to change the angle, but I converted mine to hydraulic angling and it works great.