It wont work unless you cut out the base, the shocks mount completely different if you look in the pic of the 1125 you can see how the shock is offset and the XB is centered, then look at the under tray you want, it has an offset for the shock, so you will either have to fiberglass that in and cut it in the center or have a big hole, on the side.
Might be more issues but that is just one that pops out at me.