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Hi, The early 40 Standard production units were no different than the late M units. The 40 Standard right at that point in time was simply an M with a number on it, rather than a letter. All I can recall as being different was the grille (slats gone and vertical screens installed instead). That was a styling cue to make folks think it was, indeed, an all new model. The problem is that each and every old JD model number didn't mean what you think it does. They are all guilty of slow evolution. So, an early M and a late 40 will have all sorts of little differences, while a late M and an early 40 are practically identical. This is because a late 40 is more like an early 320 than it was an early 40.... Many parts, though, remained the same between the early production M and the last production 440's. You need a copy of the JD parts manual to figure it all out. It shows the changes by model *and* serial number. For example, there are something like 30 pages devoted to front-end parts alone and they cover everything there was. Having said all that, if the 40 parts tractor you know of is a Standard (40s), then it's quite likely that the parts will work on the M. I can't recall there being any differences in the M front parts and the 40 Standard (and even the 320 and 330 parts - I think they were all the same on the standard versions). You might need to perform a few minor modifications, but they should be useable. Stan
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