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I think HM300's have a bar across the back end...
They look like the "341 covid pipes" I got from CMSNL. When nothing else was available and the word was, they might not be coming back either. I had also heard DSS was selling some 341's from time to time. Mine are on the K0 "nugget" and sound awful, so I run them with the baffles out. I'd compare numbers but it's in my race car trailer and in storage. Z1 parts has some 300 no number pipes now, probably the Busso's I already paid for. https://z1parts.net/1970-1976-cb750-k0-k6-exhaust-set/