The 87 and 187 were two-way plows. The 92 and 192 were one-way. The 87 and 92 were the original plows that came out in 1939 when the tractor was introduced. The 187 and 192 were the later, improved versions. The main differences were that the later plows were stronger than the earlier versions. Virtually every part was beefed up. There was probably some overlap on production dates. The 187 and 192 were built from 1941, while the 87 and 92 may have been built into 1942.
I'd have to go through the manuals to see specific differences.
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