Thanks, after days of searching I also found them today. They are in Victoria. He has 750 and 400, but no 550's, said he has never heard of one and tells me he is a Honda collector. Explained that they look like the 4 into 1 400. Said he would make headers for around $600 and would have a muffler that should work for over $300, so all up with postage around $1000.
I sent a few emails to the USA and UK, so waiting for a reply from them. The prices range from around $350 mild steel to $500 for stainless steel. I am hoping if I get one from the UK they take the 20% VAT off, which I sure they do. So will keep searching, there is also Pipemasters in Qlds, not sure if they do them or anyone here delt with them, but will give them a call also.
Will take the old one to an exhaust place see if they can patch them so I can get it over for rego, if that works, least I can ride while looking.
So any info from riders on who they have used for any of their Honda 4"s would be great. If you delt with a decent mob, don't care if it is overseas or Australia,let me know and I will contact them, thanks all.