John: Both, the parallel distance the beams are from each other, plus all bottoms are not the same size. For example a 12" bottom probably could not be used as a 16" bottom. Most bottoms will do two sizes, but that is about the limit.
Here in Canada the IH plows built at Hamilton had adjustable width plow beam frames. For example my one point fast hitch 2 bottom plow. Frame can be set at 10", 11", 12" and 14". My bottoms work fine on 10", 11" or 12", but not 14". There is a larger 2 bottom frame, can be adjusted for 12", 14" or 16" bottoms. You'll get the same in 3 and 4 bottom plows. Most plows larger than that are usually 16" only or 16" and 18". I expect there are about 4 sizes of bottoms to cover every size from 10" to 18".
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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