Recently I purchased 5 slab weights from a tractor parts place in northern Indiana. I got them home and I had them sandblasted and I primed and painted them. I found out quickly they are not Deere made plates. They don't stack against each other well at all and they are different sizes between each other and don't look decent. So I am going to return them all. The 3 I do have from the beginning have the part number that starts with an R. And they are the correct P/n from Deere. And they fit together perfectly and look decent. The ones I got from the tractor parts place have no numbers and my guess is they are foundary slab plates. I know of a guy who is selling plates that have RE and the P/n on them. Are they Deere slab plates? If they aren't, will they fit together against my plates and are they the same size? How many different company made these slab plates?