The 1125's would need different rear sliders but not because of the axle rather the swingarm which give cause to need different rear sliders on the 1125's
You can see here how there is a inset for the axle
Ahhhh...so it's more of an OD restriction? If the slider was a small enough OD, it might fit in that recess? Would any 1125 owners be kind enough to measure that for me (right & left swing-arm bore diameter & maximum depth)?