Gary, In this forum, go back to 4-10-13. A man named Paul helped me bring to date a planter plate info piece I wrote a few yrs ago.
First look up "JD 290" planter topic of about April 10. Pad down until you come to a blue marker named "LA on plates" or something like that.
Hopefully my info on plates will help you.
You don"t need every plate for your planter, just the plates to match the seed your dealer is selling you. Need more help, let me know.
LA in WI