I might not have been very clear on the IH grain platform numbers. The Model numbers 710,820 1020 had nothing to do with the width of the head.
A 820 16 foot head, would be how it was advertised. Just as a 820 25 foot would be listed that way or a 820 20 foot. Where the JD 216 and 220 was all that was needed to be listed. 200 series 16 foot and 20 foot.
Clear as mud right.