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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