No mate, not yet but someone has recently started doing 350 four ones so there is a dim glimmer of hope, I think the only thing stopping you putting the early "trumpet" type on is the exhaust brackets to frame, several years ago, much to my now dismay, i fitted a set of 77/78 pipes to a US 75 550 K2 and had to cut and shut the rear brake pedal to clear the exhaust so going the other way ought to work. Should you wish to come all the way over here i have 2 sets, one ofwhich you can trial fit but not buy if you wish