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 - Trenching With a Plow - by Staff. Introduction: This interesting information came from one of the discussion forums here at YT. We thought we should place it up front so it could be read by anyone interested in putting old iron to work. [Editor] I tried something new today, and it worked so well I thought I should post it - in case it might help someone else. I'm running 100 yards of 4" drain pipe from the gutter downspouts of our house to a pond down the hill. This should hel
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