There were several models of large pull type plows.
The model 448 was a rigid frame plow and was availabie up to 10 bottoms with 16" or 18" bottoms. That model was replaced by the 449 with the same number of bottoms and cutting widths.
The models 2549 and 2588 were flex-back plows with a 4, 5 or 6 bottom drawn plow in the front and a 4, 5 or 6 bottom 3 point plow in the rear.
The 5549 had 16" or 18" bottoms for a maxium cutting width of 218 inches. The 5588 had 18" or 20" bottoms with a maxium cutting width of 240 inches.
About a month ago I see a real nice Oliver 450 cushion trip 6X16 plow that was going to be sold at a sale. I don't know what it brought.