My YM240 (same tractor) came with a Great Bend loader. Looking at GB's current photos I don't think they have changed much in 20 years.
See my sig photos.
This GB subframe starts at the lower large bolt below the starter motor. It skips the other large bolt there. (See attached photo). Then a plate is bolted upward to the clutch housing, (next photo) and extensions to the rear are welded to the towbar mount beneath the rear axle. (third photo).
There is also a u-frame welded to the tractor's front frame rails, and the loader has a single grille protector crossmember set low enough to let the hood tilt forward. Hope this helps!