Here is a picture courtesy of Killer_B of the quick hitch used on both the BX series, and the B series. The Quick Hitch is slightly different in the tractor mounting dimensions between the two, but the part that attaches to the front implements is the same.
Here's some photo's for you. The first two are from a BX1500 I believe. I saved them to help with my modification. I have the 54" light duty blade that I converted to 4-way hydraulics from manual angle. No idea if the L blade will fit this quick hitch. Hope the pic's are helpful.