I was told by an old-timer that the 8N's came with them but not the 9N's.  Don't know about the 2N's.  Supposed to interchange.  I saw a picture of one 9N where a guy fabricated running boards out of expanded metal and bolted them at the back and had a strap over the front foot peg to hold it in place. 

Thanks for all of the info.  It looks like my tractor has the 9N rear axle, wheels, etc, and an 8N motor, since the serial number starts with "8N".  The tractor has a hydraulic front end loader, made by Dearborn Equipment Co and the only flaws are a bucket that needs to be rebuilt and some very old hydraulic hoses that we will replace.  I'm going to clean it up and restore the red and gray paint scheme.  I haven't live on a farm for over 40 years, had a "modern" 1961 Massey Ferguson when I was a kid, so it's been a while since I've used a tractor.  I started the old Ford up and it is just like riding a bicycle, you never really forget!  Got 9 acres to clean up, spruce up, work on the deer, turkey, elk habitat, so I can't wait to get the tractor to work!  Again, thanks for all of your inputs.