Attachments for wd45 mounted corn picker

Had a neighbor stop by when i was putting away equipment. He was saying that his grand dad had a mounted allis picker(dosen't remember which model) and the tractor had attachments to center the seat and the steering wheel. He also said there was a different right brake pedal.
I looked at my operating manual ( got the original corn harvester) and i didn't see these parts.
Anybody ever hear about these? Did allis make them or are they aftermarket? One of my wd45 's has a flip over seat so the seat stays dry if it gets caught in the rain but he says that was not it.

I suppose it's possible, seems like a lot of work & fabrication to just move the steering wheel a few inches and what do you really gain.  if you're used to operating it from an offset position-what's the big deal about operating a picker? I doubt it was an Allis mod.  Someone may prove me wrong & I'll admit the error.

Possibly to get out of the dust more and improve visibility? I have that offset steering adapter on a WD45 NF with power steering. It also has the offset flip over seat. The seat is similar to D series or my 170. I do appreciate the improved visibility the higher seating position provides. Looking at photos of a WD45 with mounted picker the brake pedals are mighty close to the attachment. Heavy boots could be problematic?