Looking at the quadrants for the reversing pole and checking the measurements I notice that the distance from centre line to quadrant end hole centre line of 1 13/16" brings the rear of the quadrant beyond the side tank by quite a way. Looking at the full size the quadrant appears to extend beyond the side tank by no more than the width of the quadrant (my photo is a bit fuzzy). I have changed the 1 13/16" measurement to 1 9/16" which mimics the full size and brings the quadrant 9/32" beyond the end of the tank.
I also notice on the full size the foot bar is not fixed to the end of the quadrant but below it and that the whole quadrant area from floor to quadrant is enclosed. But maybe not all Prairies were like this ?