It all depends on your subframe for your blade. I have seen some subframes that have the QA pins on them and holes for mounting and I have seen some subframes that only have the QA pins on them (though this may have been a PO mod...
) and some that only have the holes in them. If your subframe has holes above the QA pins, then you can attach it and ignore the pins and it should fit, if it only has the pins, then you can drill holes or weld on the QA brackets---which would allow you to use other QA implements in the future as well.
Cub Cadet 123