Found these in a box of a dealer we bought out and the only thing I know is that they're made by Mikuni and they're made for a vintage 4 cylinder Japanese street bike . The only way of identifying them is comparing them against your carburetors and making sure that the exact same thing before purchasing . Make sure you're comfortable in purchasing this under those conditions because they are not returnable and I don't know anything about them . Selling them for parts only because of that. Don't know anything about the condition of the carburetors. Please look over the pictures closely before purchasing. No guarantees or warranties and no return.