Honda-SOHC

Hi all, A few months ago I bought a Motad 4 into 1 system for my 1974 US spec CB550 K0. I have just got around to fitting it and have hit a problem with the silencer bracket which does not fit properly. I think the one I need should be stamped M5H, the one I have is stamped M55H. Can anyone on here confirm this please? To make matters worse I believe Motad have gone into administration recently so I cannot speak to them. If I do need an M5H and anyone has one they could sell me that would be great! Thanks in advance, Michael.
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