The serial number for the 565, 566, and 568 plows was a sticker that was supposed to get placed on the front of the plow, but if it's like our 565 that sticker is long gone so there is no number. Our 565 is a 4 bottom backbone, but is set up to be a 3-16 plow, instead of 4-16. We found it was simply cheaper to find another 4-16 plow (546 semi-mounted) instead of buying the parts needed to add the 4th bottom. One place you could try is Wis. Tractro parts (877) 530-2010. When I priced out parts to add the 4th bottom to the front of our 565, the parts would have cost us about $5-600. I got the new plow for $300, and it's got a much heavier backbone. Another thing is that plows don't have to have the coulters, they just make the furrow wall cleaner and help in high trash situations. If you try to plow with more than 1" of frost in the ground in the fall, you'll likely break off the crank that the coulters mount to, then you'll need the entire assembly again to replace it. If you have any pictures, they would help a little in helping you. Donovan from Wisconsin
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