Corn-national Inter-binder and their ?design? philosophy

So I'm laying on a cardboard on the ground, under the IHC Farmall 100, trying to work out how to mount the "new" backhoe, and it turns out THERE IS A FOOT STEP???? cast into the BOTTOM of one of the axle tubes. Now this is NOT repeat NOT installed upside down, as the entire structure is not built in such a way, and there are design features such as clutch linkage, etc, SO WHY??? LOLOL

IHCfootpad.JPG