I have a 4 into 2 I took off a 1981 CB750K and I'm told it will fit a 1980. I'm in Illinois and shipping probably won't be cheap, but if you want it, I'm willing to sell at a reasonable price. I can send I picture, if you like. In fact, check out Craigslist Chicago and search on CB750 4 into 2. I should have the pictures up in about 20 minutes.