C1X-24 planter plate and seed size

Does anyone know what MEDIUM ROUND seed kernel is best for a C1X-24 plate?
For example, DEKALB has AF, AF2, AR, AR2, P22. Not sure what they all mean.

You do not buy your corn for your seed plate. You need to get the corn you want then buy the right plate for the corn. Tom

Thanks for your reply. I'm not ready to give up though. According to Lincoln Ag, who makes the plate I have, the CIX is one of the most common plates they sell for corn and they told me it takes a 'Medium Round' seed kernel, so I was hoping someone would recognize it based on its popularity, rather than buy new plates for whatever bag of corn was on top of the pile, for instance. Its a 3 acre food plot, so I just want a 'round up' corn, and the brand is not amajor issue for me. It's not impossible to match the plate to the seed, if the seed label either has MR or C1X on it, or a seed dealor knows what varities of seed is 'MR'. There are different grades of 'Medium Round': SMR = small med. round, MR = med . round, and MLR = med. large round; all these 'mediums' use a different plate. After I sent the post, and prior to reading your reply, I decided to contact a seed dealer to see what is printed on the labels of seed corn. I havent heard back from him yet. Meanwhile, after reading your post, I did a google search on corn seed labels, and unbelieveably the first label that came up had Suggested Plate as C1X. So I have my answer, or at least a starting point to show the seed dealor. Your post was helpful in spurring me onto do further research. Thank you.

Been using sized seed for a while and one thing I've found is very few seed companies size seed acutely these days. Seems they can get uniform size and shape in the bags but those sizes very from company to company and year to year. Last year my seed bags said medium flat seed and were all the same, but required my extra small flat plate. Last year the same brand and size seed took small flat plate. The proper way is to by the size and shape seed you prefer, then match it to the proper plate.