Most companies used the standard 9-bolt pattern on duals, but there are a few exceptions. I really don't know if Massey is one of them. If they are 9-bolt, just find some hubs to fit your M and you are good to go. If not, you are gonna need an adapter plate. Nothing a good welding shop can't fix! Or if it is a permanent or high-hp puller, just use weld-on hubs that fit your wheels! 
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Find someone who used to run duals on their M or 560 back in the day.... They usually got rid of the duals, but the hubs tend to lurk in the corners of sheds! BTW: those axles are the same from M's, through 460, 560, 656, 666, 686, and even the utilities I think.
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